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Filters

CTIO Filters

Overview

Mosaic Imager (Blanco 4-m Prime Focus)

The NOAO MOSAIC Imager II (as did the BTC before it) takes square filters 146 x 146 mm, 12 mm thick. We are slowly increasing our stock of filters in this size, so if you don't see what you need here, please contact us. What do we have, and what are the focus offsets? [1]

 

SOAR and Schmidt

The SOAR Optical Imager (minimosaic of two 2Kx4K EEV CCDs) and the Schmidt use 4 inch square filters up to 10 mm thick. We have quite a selection of filters in this size, see the 3" & 4"filter list [2]. Recent acquisitions are:

  • Sloan digital Sky Survey (SDSS) set ugriz, 4 x 4 inch. cwl/fwhm are u (3513/628), g (4759/1430), r (6265/1483), i (7734/1500), z (9100/1400). These are nominal figures, note that the long wavelength cutoff for the z filter is CCD dependent.
  • Calcium H&K filter, 4 x 4 inch. cwl/fwhm is 3960/100, peak transmission 50%.
  • For SOAR - a dedicated Johnson-Cousins UBVRI set, an SDSS ugriz set, and a Stromgren uvby set.

 

Cassegrain focus imaging (1.5-m, 0.9-m)

For Cass imaging we use 3 inch square filters up to 10 mm thick. We have quite a good selection of filters in this size too. The cass filter wheel assembly has two wheels holding up to 8 3x3 filters each. We also have a single module that can hold 5 4x4 filters, so filters in this size can be used if we don't have a 3x3 equivalent.

 

Oh No! CTIO doesn't have the filter I need!!!

Now and then people have asked to use one or more of our 2x2 inch interference filters due to not having it in 3x3 or 4x4 inch size, being prepared to accept some vignetting. Be warned! Most of these filters are many years old, and some have seen a lot of use. If you want to use some weird filter it's better to (a) buy one yourself, or (b) convince us to buy it for you. Filters can take a long time to make (several months to over a year for the 146x146 mm narrow band filters). Prices vary with manufacturer, and the specifications you ask for, we can recommend if you like. Plan on spending $2500 - $5000 for a 146 x 146 mm filter, half that for 3x3 inch or 4x4 inch.

 

Alistair Walker 17 April 2000, updated 4 April 2006

Filter Transmission setup

   Contents:
  Description
  Transmission Measurement Procedure
  Instructions for plotting nice graphs
  Tricks for the measurements

 

During January 2001, a new setup was assembled to measure filter transmission on Cerro Tololo . Any thickness, shape and size of filters up to 6x6" can be measured.

Description

The S2000 is a miniature fiber optics spectrometer made by Ocean Optics [3] with grating of 600 lines/mm blazed for 750 nm, configured for spectral range of 600-1200 nm, with 10um wide slit and long pass filter (305nm) permanently installed. UV2, a UV detector upgrade for application < 360 nm, and L2, a detector collecting lens of fused silica for increased light collector efficiency, were also requested from Ocean Optics. Fiber optics with 400um core diameter are used.

  • Dispersion: 0.3 (nm/pixel).
  • Resolution: 3.2 pixel.
  • Optical Resolution = dispersion x resolution = 0.96 nm FWHM.

The fiber optics spectrometer S2000 is a crossed Czerny-Turner design, with no moving parts. The basic characteristic of the Czerny-Turner mount is to use two identical off-axis concave spherical mirrors as the collimating and focusing elements, with the important property of canceling the coma aberration that is inherent with spherical mirrors and which otherwise inhibit resolution.
specanim.gif

Light enters the optical fiber and is efficiently transmitted to the spectrometer. Once in the spectrometer, a spherical mirror collimates the divergent light emerging from the optical fiber. A plane grating diffracts the collimated light, the resulting diffracted light is focused by a second spherical mirror. An image of the spectrum is projected onto a 1 x 2048 linear CCD array, and the data is transferred to a computer through an A/D card.

The light source used is a halogen lamp with a quartz bulb (General Electric 787, same as the ones used for the 4m dome flat lights), that we feed with a stabilized power supply at 7V (1.77 A). A ground glass in front of the lamp is used to create a diffuse source.

The Spectrometer comes with the OOIBase32 software, which is the spectrometer operation software. From time to time it is necessary to check the calibration of the spectrometer's wavelength. For this we use a light source that produces known spectral lines, in our case Ocean Optics' HG-1 Mercury-Argon lamp. We did that calibration in Jan 2001 and found the following parameters:

  • 1st coefficient: 0.36780
  • 2nd coefficient: -2.3734 e -5
  • 3rd coefficient: -1.5193 e -9
  • Intercept: 589.99860

which produced a maximal residual error of 0.2 nm. Follow the guideline in the help menu to perform the calibration.

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Transmission Measurement Procedure

  • In scope mode Sbutton.gif, press GoButton.gif to take a spectrum of the light source, adjusting integration time (1) until you get about 3000 count maximum.
  • Make sure you are using the proper selection filter
  • Take a Global Reference GlobalReference.gif (on first icon line)
  • Block the light going into the fiber connected to the spectrometer, press GoButton.gif, wait until you see a trace at the zero level and take a Global Dark GlobalDark.gif (on first icon line)
  • Select Transmission mode Tbutton.gif
  • Take a local reference GlobalReference.gif (on second icon line): you should then see a flat line at 100 % (maybe with some isolated vertical lines, if not go back to Scope mode and retry).
  • Slide the filter in the beam
  • Press GoButton.gifand the absolute transmission curve should appear.
  • To save, select in the menu: File | Save | Processed.

 

Notes:

1. The longer the integration time, the slower the system refresh time. At about 500ms, it is already noticeably slow, at 1sec integration time, it becomes terribly slow and sometimes fails. Whenever the software freezes, you need to exit the program, cycle the spectrometer power and start again.

2. In each step make sure the data is well taken by watching out the status message (should say 'Ready').

3. Use average (5 to 10) if the signal is noisy. References, dark and measurements must be taken under same conditions (integration, average,...)

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Instructions for plotting nice graphs

For data processing we recommend to use Microcal Origin Software. This software has useful functions (like smoothing and Gaussian Fit that Excel doesn't have as readily).

* Import the file saved by OOIBase to an Origin worksheet. Select File | Import | ASCII select the *.* extension.
* Plot the data: Plot and select the type of plot you want. We suggest 'Line'.
* Choose your column variables for the X and Y axes.
* You can re-scale the Graph by clicking the axes or choosing Graph.
* You can always add new columns in the table selecting the Columns menu. Handling the columns of numbers is very similar to what is done with Excel.

For some plots it will be useful to use the "Smoothing" or "Fit as Gaussian" options. For Smoothing activate the Graph and select: Analysis | Smoothing | Adjacent Averaging. This opens the Smooth Points dialog box were you specify the variable that control the degree of smoothing. The smoothed value at index i is the average of data points in the interval [i-(n-1)/2 , i + (n-1)/2]. Increase the degree of smoothing until you get satisfactory results (20 is usually enough). Then plot again choosing as new variable the smoothed column.

To fit Gaussian select Analysis | Fit Gaussian. That function is useful especially for narrow band filters to avoid the triangular peak that usually shows up because of the finite resolution. Make sure the fit is good, ie. the peak, Fwhm and slopes are not affected in the process.

Worksheet and graph may be exported to another applications by creating an export file. Activate the data table and select File | Export ASCII. If you want to export the Graph, select File | Export Page and choose the file type you want to export.

To save select File | Save Project As

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Tricks for the measurements

In all measurements, you need a wavelength selection filter to separate the orders. In general we use two selection filters: Corion short wave pass LS 550 (plot [4] and data [5]) and Schott long wave pass OG 590 [6].

* For all filters with transmission range above 590 nm, you will see the transmission in first order directly and need to use OG 590.
* For all filters with transmission range below 550 nm, you will see the transmission in second order and need to use LS 550 (and divide the wavelength obtained by two).
* For all filters with transmission range around 550-590 nm, you need to make 2 sets of data, one with the LS600 selection filter and possibly one with the OG590 selection filter, then stitch together the results to obtain a single graph. Usually the resulting graph has some noise at the union, so you need to smooth it.
* For blue filters, you might want to use the Bj filter for better transmission (less noise at 3300 A).
* For measurements near the atmospheric cutoff at 330nm, use the UVpass Corion filter (see plot [7])

Measuring a filter against itself will show you a line at 100% in the useful transmission range of the filter and increasing noise outside that range, which is sometimes useful to assess the bandpass width of the filter in order to select the most appropriate wavelength selection filter for the absolute transmission measurement.

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filtbench.jpg

 

 

See the filters [8] already remeasured with this new setup.

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Written by Constanza Araujo (optics student at the Catholic University of Vaparaiso), 1 February 2001.

 

CTIO 3x3-inch and 4x4-inch Filters

The standard filter size for the 0.9-m and 1.5-m CFCCD is 3x3 inch, which are mounted in two filter wheels which each can hold up to 8 filters (or 7 plus clear). We have a single wheel which can hold up to 5 4x4 inch filters which can be installed in place of one of the 8-position wheels. At the Schmidt, and the 4-m PFCCD (now retired) 4x4 inch filters are required in order to avoid vignetting. We do have adaptors to allow the use of smaller filters (eg 2x2 inch), if the vignetting is tolerable, but see the warning note at the head of the filter list. The BTC and Mosaic II imagers, used at the 4-m prime focus, take filters 5.75 x 5.75 inches (146x146 mm) and nominally 12 mm thick.

 

FILTER SIZE Thick Cent fwhm Trans FILTER SET Filter curves COMMENTS
/width (") (mm.) (A) (A) (%)   Plot Data
file     
                   
3513/628 4X4         SDSS u      
3530/280 4x4 9.15 3530 280 37.14 u Stromgren      
3570/660 3x3   3570 660 80.59 U liq. CuSO4 Tek set #2      
3575/600 3x3 9.09 3575 600 74.21 U liq. CuSO4 Tek set #1      
3580/610 4x4 9.32 3580 610 74.66 U liq. CuSO4 set#1 4mts      
36237605 3x3 8.83 3623 605 67.66 U liq. CuSO4 Tek set#3      
3960/100 4x4         Ca H&K line filter      
3996/1042 3x3 8.11 3996 1042 62.70 C Wash      
4000/1030 4x4 8.45 4000 1030 62.45 C Wash      
4118/146 4x4 9.87 4118 146 52.04 v Stromgren 4x4      
4185/1030 4x4 5.40 4185 1030 70.44 B Harris set#1 4mts      
4202/1050 3x3   4200 1050 66.16 B Tek set#2      
4203/1050 3x3 5.26 4200 1050 66.72 B Tek set#3      
4201/1050 3x3 5.17 4200 1050 66.48 B Tek set#1      
4340/980 3x3 6.38 4341 980 60.33 B Harris set 1      
4357/1665 4x4 3.65 4357 1665 88.19 B Tyson "J"      
4345/980 3x3 6.33 4345 980 60.85 B Harris set 2      
4200/1050 4x4         B set# 2 Schmidt      
4697/196 4x4 9.85 4697 196 71.27 b Str"m.  4x4      
4759/1430 4x4         SDSS g      
4940/700 4x4 8.95 4920 670 93.09 Gunn g      
5025/1023 3x3 8.08 5025 1023 88.60 M Wash.      
5019/50 4x4 7.83 5027 50 79.48        
5040/990 4x4 8.25 5040 990 88.23 M Wash.      
5118/900 3x3 5.05 5118 900 81.39 g Gunn-T      
5130/155 4x4 7.76 5121 133 84.13 DDO 51 Wash. set      
5295/1590 4x4 5.24 5292 1625 90.66 HST "V"      
5362/895 3x3 6.14 5362 895 76.80 V Harris set 1      
5370/900 3x3 6.18 5370 900 75.64 V Harris set 2      
5438/1026 3x3   5438 1026 91.91 V Tek set#2      
5443/1060 4x4         V set#2 Schmidt      
5443/1060 4x4 5.12 5443 1060 88.50 V Harris set#1 4mts      
5475/1000 3x3   5475 1000 87.71 V Tek set #1      
5497/241 4x4 9.74 5478 244 70.83 y Str"m. 4x4      
6120/140 3x3 7.97 6115 135 85.89 Supernova      
6130/590 4x4 8.35 6130 590 56.19 T1 Wash.     .9% leak at 1.2u.
6152/625 3x3 8.21 6152 625 58.06 T1 Wash.     1% leak at 1.0u.
6265/1483 4x4         SDSS r      
6410/1470 3x3 5.23 6410 1470 81.76 R Tek set#3      
642571500 3x3 5.25 6425 1500 79.69 R Tek set#1      
6437/1525 4x4 5.22 6437 1525 81.38 R harris set#1 4mts      
6437/1525 4x4         R set #2 Schmidt      
6400/1450 3x3   6400 1450 81.09 R Tek set #2      
6475/1600 3x3 6.18 6475 1600 81.70 R Harris set 1      
6493/1445 3x3 6.15 6493 1445 77.00 R Harris set 2      
6560/900 4x4 9.19 6495 900 94.95 Gunn r      
656375-3 3x3 5.61 6559 64 89.37        
656375-4 4x4 5.54 6567 68 82.32        
660075-3 3x3 5.57 6598 69 87.77        
660075-4 4x4 5.57 6600 67 84.77        
6728/1000 3x3 5.05 6728 1000 93.83 r Gunn-T      
6738/50 4x4 7.97 6744 50 87.83        
7734/50 4x4         SDSS i      
8120/1500 4x4 9.22 8065 1600 86.60 Gunn i      
8067/1485 3x3 6.11 8067 1485 95.49 I kc Tek set#3      
8075/1500 3x3 6.13 8075 1500 95.53 I kc Tek set#1      
8075/1500 4x4 6.19 8075 1500 94.09 I kc set#1 4mts      
8118/1415 3X3   8118 1415 96.63 I kc Tek set#2      
8100/1500 3X3 5.08 8100 1500 93.00 I Gunn-T      
8300/2500 4x4 5.43 8310 2560 98.73 HST "I"      
9100/1400 4x4         SDSS z      
9100/1400 4x4         z Gunn      
9100/1400 3x3         z Gunn      

 

ISPI Filters

ISPI is offered with the broad band Y, J, H, Ks filters, as well as a set of narrow band filters. Basic data are given in the tables below. Filter scans are available for some of the filters here [9].

ISPI Broad Band Filters
Filter Central wavelength
(micron)		 Wavelengths @80%
(micron)
J 1.25 1.176 1.322
H 1.635 1.5005 1.7705
Ks 2.150 1.9915 2.2955
Y 1.0381 BW 0.1457mu

Fluxes, isophotal wavelengths, and isophotal frequencies for Vega have been determined by Tokunaga and Vacca [10] for J, H, and K' filters which comprise part of the MKO/Gemini filter set. Copies of these filters were used in ISPI up until 2004B.

ISPI Narrow Band Filters
Filter Central wavelength
(micron)		 Wavelengths @80%
(micron)
Cont-203 2.0336 2.0262 2.0400
He I 2.0618 2.0545 2.0674
C IV 2.0826 2.0753 2.0892
H2 2.1262 2.125 2.146
Continuum,
2.14 mu		 2.1462 2.1385 2.1532
Br gamma 2.1648 2.1592 2.1738
He II 2.1911 2.1845 2.1976
H2 & continuum 2.25 mu 2.2527 2.2428 2.2618

February 12, 2007

CTIO 5.75X5.75-inch Filters

A. Walker 18 Dec 2002

 

The Mosaic II imager, used at the Blanco 4-m prime focus, takes filters that are 146x146mm and 12mm (nominal) thick.

Focus offsets are referred to the R filter, since this is the filter we use for taking focus frames each night when the Mosaic is installed in order to monitor telescope performance.

We are (slowly) measuring these filters, let us know if there is any one you particular want to have us scan. Note that the Sloan set (griz) and the Johnson-Cousins BVR (but not I) sets should be near-identical to those at KPNO, see the KPNO Mosaic Filters. [11]

A set of standardized filter names and IDs have been developed to ensure proper application of astrometric solutions and real-time display processing (as well as future archive uniformity). These official names are listed in the Mosaic filter list [12]web page.

 

Filter Center
wavelegth		 fwhm focus offset
microns		 NOAO
code		 Status
      
U 3570 650 -185 c6001 OK
B 4360 990 +10 c6002 OK
V 5370 940 +30 c6026 from 21 OCT 2000
R 6440 1510 0 c6004 OK ... filter offset ref
I 8050 1500 +10 c6028 from 24 May 2003
      
VR Stubbs
aka VR
Supermacho		 6100 2000 0 c6027 transmission curve [13]
      
C (Wash) 4000 1000 +260 c6006 OK
M (Wash) 5020 1020 +260 c6007 OK
D51 (DDO) 5130 154 -55 c6008 OK
      
[OII] 3727* 50 ? c3012 not tested yet
[OIII] 4990* 60 +130 c6014 OK
Halpha 6563* 80 +65 c6009 cwl, fwhm nominal
Halpha+8 6650* 80 -35 c6011 cwl, fwhm nominal
[SII] 6725* 80 +60 c6013 cwl, fwhm nominal
      
u (SDSS) 3600  400 +230 c6021  cwl, fwhm approx,
Red Leak! [14]
g (SDSS) 4813  1537  +30 c6017  "set #2"
(in use 8/2000-)
r (SDSS) 6287  1468  +120 c6018  "set #2"
in use 8/2000-)
i (SDSS) 7732  1548  -20 c6019  "set #2"
(in use 8/2000-)
z (SDSS) 9400  2000  -15 c6020  OK
      
Bj (Tyson) 4350  1650  ?  c6024  #3, on loan
from A. Tyson
I (Tyson)  8800  2000  ?  c6025  cwl, fwhm approx
           
White 6500 5000 ? c6016 just a piece
of fused silica

 
Retired Filters
g (SDSS) 4825 1380 ? c6015 "set #3",
red cut-off a bit too red
(in use <8/2000)
V 5370 940 115 c6003 small chip in corner,
in use <10/2000
Bj 4350 1650 ? -- broken...
Bj 4350 1650 ? -- broken...
I 8050 1500 +25 c6005 Filter damaged
Nov 2002-
The are civered by CCD-1
(SW corner) is unusable

* = NOTE that the central wavelength of narrow band filters (actually all filters, but it is only significant for narrow band filters) is shifted aprox. 15A to the BLUE in the f/2.87 beam of the Blanco 4m + PFADC corrector as compared to the transmission measured in parallel light. The central wavelengths quoted above are nominally for when the filters are used at PF, with the aprox. 15A shift included.

 

Last updated: 2003 June 4 by C.Smith

Staff Contacts:
Alistair Walker: awalkerATnoao.edu
Chris Smith: csmithATnoao.edu

u leak

Subject: There is a leak -- just how much does it matter -- your call
Date: Fri, 8 Mar 2002 16:25:43 -0700 (MST)
From: Buell Jannuzi

Hi Guys,

Well there is a red leak in the ctio SDSS u' filter -- at a very low level, but perhaps enough to explain the flat field counts Mauro reports -- I'm afraid I have not had time to think this through carefully. Below are attached the asci data files containing the traces (done in the center of the filter) made by Jim DeVeny. The good news is that in the band-pass the ctio SDSS u' filter is a good match to the tracing I have on file for the actual SDSS u' filter (measured in air -- not in vacuum as actually used). The bad news is that while the SDSS u' does not appear to have a red leak (actual measurements of that filter between 8100 and 1100 angstroms so nothing), apparently because in addition to the 1mm UG11 + 1mm BG38 there is a film to, and now I'm quoting the message I got in 1996 about this filter, "suppresses a strong leak around 7000 Angstroms and acts as an AR coating in the passband. Now, the ctio SDSS u' filter does not have strong leak at 7000 -- but does have a leak near H-alpha (0.04%, tiny), with an increasing leak longward of 8000, but again, not huge -- but very significantly different from the SDSS filter.

As I said, I'm not 100% sure the measured leak accounts for Mauro's measured count difference in the flats he took last night -- but given the tracing I'm hard pressed to understand how the ctio SDSS u' filter could yield more counts than the Harris U without there being a significant leak (one might have hoped that the poor red response of the CCDs might have helped, but it looks like they are hot enough in the red to see some of the leaked light).

Buell

Attached files:

Note that the two data files will differ ever so slightly in the region covered by both tracings, but the slit used was 5 times larger (lower res) in the second set up.

MOSAIC Filters

The Mosaic II imager, used at the Blanco 4-m prime focus, takes filters that are 146x146 mm and 12 mm (nominal) thick. A set of standardized filter names and IDs for both Mosaic I on the KPNO Mayall and Mosaic II on the CTIO Blanco have been developed to ensure proper application of astrometric solutions and real-time display processing (as well as future archive uniformity). These official names are listed in the Mosaic filter list [12] web page.

Focus offsets are referred to the R filter, since this is the filter we use for taking focus frames each night when the Mosaic is installed in order to monitor telescope performance.
Note that the Sloan set (griz) and the Johnson-Cousins BVR (but not I) sets should be near-identical to those at KPNO, see the KPNO Mosaic Filters [11].

Note: The central wavelength of narrow band filters (actually all filters, but it is very significant for narrow band filters) is shifted  approx. 15A to the BLUE in the f/2.87 beam of the Blanco 4m + PFADC corrector as compared to the transmission measured in parallel light. The central wavelengths quoated below are nominally for when the filters used at PF, with the approx. 15A shift included. Furthermore, the filter transmission curves presented below show the simulated filter tranmission curve for the Blanco 4m + PFADC f/2.87 beam.

Note: The Blanco prime focus corrector has poor response in the UV: 90% (4000A), 85% (3800A), 74% (3650A), 54% (3500A), 31% (3400A), 11% (3350A), 0% (3300A). These are calculations from the glass types and AR coating specifications, and the figures for 3300-3400A are rather uncertain. YOU STRONGLY ENCOURAGED TO USE THE u(SDSS) filter rather than the U filter. Neither of these filters, in combination with the CCDs and optical corrector, match the standard passbands perfectly. The U filter uses a (troublesome!) copper sulphate solution as red blocker, whereas the SDSS u filter is an interference filter.

 

Filter Central
Wavelength
(A)		 FMHM
(A)		 Focus
Offset
(um)		 Status NOAO
Code		   
Transmission Curves
Plot Data File
U 3570 650 -185 Ok c6001 .jpg [19]   .ps [20] . txt [21]
B 4360 990  +10 OK c6002 .jpg [22]   .ps [23] . txt [24]
V 5370 940  -30 From 21 Oct 2000 c6026 .jpg [25]   .ps [26] . txt [27]
R 6440 1510  0 Ok; filter offset ref c6004 .jpg [28]   .ps [29] .txt [30]
I 8050 1500  +10 from 24 May 2003 c6028 .jpg [31]   .ps [32] .txt [33]
VR Stubbs
(aka VR Supermacho)		 6100 2000  0 Ok c6027 .jpg [34]   .ps [35]
old.jpg [36]		 .txt [37]
 
C (Wash) 3850 1075  +260 from 05 Jan 2011 c6029 .jpg [38]   .pdf [39]  
M (Wash) 5115 1375  +260  Ok c6007 .jpg [40]   .ps [41] .txt [42]
D51 (DDO) 5130 154  -55  Ok c6008 .jpg [43]   .ps [44] .txt [45]
 
[OII] 3727 50  ?   c6012 .jpg [46]   .ps [47] .txt [48]
[OIII] 4990 50  +130  Ok c6014 .jpg [49]   .ps [50] .txt [51]
Halpha 6563 80  +65  cwl, FWHM nominal c6009 .jpg [52]   .ps [53] .txt [54]
Halpha+80 6650 80  -35  cwl, FWHM nominal c6011 .jpg [55]   .ps [56] .txt [57]
[SII] 6725 80  +60  cwl, FWHM nominal c6013 .jpg [58]   .ps [59] .txt [60]
 
u (SDSS) 3600 400  +230 cwl, FWHM approx,
replacement for c6021,
NO RED LEAK		 c6022 .jpg [61]   .ps [62] .txt [63]
g (SDSS) 4813 1537  +30 "set #2" (in use 8/2000-) c6017 .jpg [64]   .ps [65] .txt [66]
r (SDSS) 6287 1468  +120 "set #2" (in use 8/2000-) c6018 .jpg [67]   .ps [68] .txt [69]
i (SDSS) 7732 1548  -20 "set #2" (in use 8/2000-) c6019 .jpg [70]   .ps [71] .txt [72]
z (SDSS) 9400 2000  -15 Ok c6020 .jpg [73]   .ps [74] .txt [75]
 
 Bj (Tyson) 4350 1650  ? #3, on loan from A. Tyson c6024 .jpg [76]   .ps [77] .txt [78]
 I (Tyson) 8800 2000  ?  cwl, FWHM approx c6025 .jpg [79]   .ps [80] .txt [81]
               
White 6500 5000   Fused Silica c6016    

 

 

Retired Fillters

Filter Central
Wavelength
(A)		 FMHM
(A)		 Focus
Offset
(um)		 Status NOAO
Code		 Transmission Curves
Plot Data File
g (SDSS) 4825 1380 ? "Set #3", red cut-off
a bit too red
(in use < 8/2000)		 c6015    
C (Wash) 3850 1075 +260  some fine scratches
on the anti reflection coating		 c6006 .jpg [82]   .ps [83] .txt [84]
V 5370 940 115 #1 broken... c6003 .jpg [85]   .ps [86] .txt [87]
Bj 4350 1650 ? #2 broken... --    
Bj 4350 1650 ? Filter damaged Nov 2002
Area covered by CCD-1
(SW corner) unusable.		 --    
Old I 8050 1500 +25   c6005 .jpg [88]   .ps [89] .txt [90]

 

 

Last updated: 2009 Dec 9, ARW

 

Staff Contacts:
Sean Points: spointsATctio.noao.edu
Alistair Walker: awalkerATctio.noao.edu

Hydra Filters

Schott Glass Filters & Echelle mode filters available for CTIO Hydra

Echelle Mode

Filters for Hydra Echelle Mode

Note! Resolutions calculated, not yet measured.

The Hydra echelle mode uses a coarse (316 l/mm) echelle grating, blazed at 63 degrees, giving an effective blaze of roughly 56120A. It operates in what are (for an echelle) very low orders (5-15). This grating is used in order#=56120/lambda, e.g. 10th order near 5600A.

When used with the large (300 microns) fibers, the SiTe 2K x 4K, and the 400mm f.l. Bench Schmidt camera, the projected size of the fiber on the CCD will be about 7 pixels. The dispersion in A/pixel is approximately the wavelength divided by 105,000, e.g. .053A/pixel at 5600A in 10th order. The resolution will be 105,000/7 or approximately 15K. When used with the 200microns slit the projected fiber size will be 4.5 pixels and the resolution about 23K. With the 100 microns slit the projected slit size will be 2.5 pixels and the resolution about 40K. There are two filters for each order, centered at orders N+25 and N+75 where N is the order number. Each filter is made as wide as possible without permitting significant amounts (maximum .2%, average much less) of any undesired order to pass through.

If the filters were perfect, this would mean that a filter centered at order N+25 would cover from (N-1)+75 to N+75 and the filter centered at N+75 would cover from N+25 to (N+1)+25. In practice the filters cannot be made this wide because they have finite "skirts" in their bandpass. Nevertheless, there will always be a filter that covers from the overlap zone below the blaze to well beyond the blaze of every order and another which covers from well below the blaze to beyond the overlap zone of every order.

The free spectral range is larger than the size of the chip. This means that there is always an optimum filter for every wavelength range.

The filters become less efficient and the skirts wider as the wavelength becomes shorter.

The current set of filters was made by cementing two 1/2" x 2" sections together. The interference filter layer does not extend quite to the edge of the original filters, so that light from more than one order passes through the cemented filter in a strip about 2mm wide on each side of the junction. Consequently, some fibers near the junction cannot be used. The bad fibers can be identified by taking an exposure with the quartz lamp. The flux increases in contaminated fibers near the center and decreases at the very center where light is blocked by the cement. About 8-10 fibers in the center of the field are typically contaminated. Fibers #203, 23, 172, 155, 90, 186, 197, 32 and 84 were reported as being compromised in one filter configuration, listed in order from most to least contaminated. The location of the problem varies to some extent between filters.

 

Filters for Hydra Echelle Mode

 

Filter Order Center
(A)		 Width
(A)		 Average
Transmission		 Plot
#3 6.75 8259 1058 84% .gif [91]
#4 7.25 7689 907 87% .gif [92]
#5 7.75 7193 784 80% .gif [93]
#6 8.25 6757 684 79% .gif [94]
#7 8.75 6371 601 78% .gif [95]
#8 9.25 6027 531 75% .gif [96]
#9 9.75 5718 472 80% .gif [97]
#10 10.25 5439 422 78% .gif [98]
#11 10.75 5186 379 75% .gif [99]
#12 11.25 4955 341 75% .gif [100]
#13 11.75 4745 309 75% .gif [101]
#14 12.25 4551 280 70% .gif [102]
#16 13.25 4207 233 47% .gif [103]
#17 13.75 4054 214 44% .gif [104]
#18 14.25 3912 196 35% .gif [105]
#19 14.75 3780 181 40% .gif [106]
#20 15.25 6356 167 50% .gif [107]

Notes:

Filters #2/8920A and #15/4372A are unavailable until further notice.

Observe that filter #18 does not have a flat top, but has a single central peak at the design wavelength.

 

22mar00-tei

rdepropis[at]ctio.noao.edu

Schott Glass Filters

Available for CTIO Hydra

IMPORTANT NOTE: The following filters are all 2mm thick, but the reference thickness shown on the curves is not 2mm in most cases. Be sure to correct for the difference in thickness!

 

Schott
Name		 Purpose Transmission
Curve		 Thickness
BG23 Bandpass ~330-620nm BG23 [108] 2mm
BG39 Bandpass ~350-580nm BG39 [109] 2mm
GG385 Longpass > ~385nm GG/OG/RG [110] 2mm
GG420 Longpass > ~420nm GG/OG/RG [110] 2mm
GG455 Longpass > ~455nm GG/OG/RG [110] 2mm
GG495 Longpass > ~495nm GG/OG/RG [110] 2mm
OG515 Longpass > ~515nm GG/OG/RG [110] 2mm
OG570 Longpass > ~570nm GG/OG/RG [110] 2mm
OG590 Longpass > ~590nm GG/OG/RG [110] 2mm
RG610 Longpass > ~610nm GG/OG/RG [110] 2mm
RG665 Longpass > ~665nm GG/OG/RG [110] 2mm

   

Last updated 1aug99
rdepropris[at]ctio.noao.edu

IR Filters

 

Band/
Wavelength		 Filter ID
(Text Data)		 Filter ID
(Graph)		 Available
for ISPI *		 Comment
Y 191A [111] 191A [112]   30mm Barr
Y 191B [113] 191B [114]   50mm Barr
Y 191C [115] 191C [116]   65mm Barr
Y 191D [117] 191D [118]   30mm Barr
I 81 [119] 81 [120]   25mm inew
J 40 [121] 40 [122]   25 mm Jcit
J 82a [123] 82a [124]   25mm Jshort
J 183 [125] 183 [126]   30mm Barr
J 186 [127] 186 [128] removed,
2004b		 60mm OCLI,
Gemini, ISPI
J 192 [129] 192 [130], scan [131] Yes 65mm Barr
H 44 [132] 44 [133]   25mm OCLI
H 184 [134] 184 [135]   30mm Barr
H 187 [136] 187 [137] removed,
2004b		 60mm OCLI,
Gemini, ISPI
H 190 190 [138] Yes 65mm Barr
K 50 [139] 50 [140]   25mm OCLI
K 185 [141] 185 [142]   30mm Barr
K' 188 188 removed,
2004b		 60mm OCLI,
Gemini, ISPI
Kshort 129 [143] 129 [144]   25mm Barr
/2MASS
Kshort 189 189 [145] Yes 65mm Barr, ISPI
2.248 H2 125 [146] 125 [147]   25mm Barr
2.248 H2 199 199 Yes 65mm Omega
2.19 He II 138 [148] 138 [149]   25mm Omega
2.19 HeII 198 198 Yes 65mm Omega
2.166w Brg 132 [150] 132 [151]   25mm Barr,
wedged
2.16 165 [152] 165 [153]   25mm Omega
2.16 Brg 197 197 Yes 65mm Omega
2.144w cont 131 [154] 131 [155]   25mm Barr,
wedged
2.14 cont 164 [156] 164 [157]   30mm Omega
2.14 cont 200 200 Yes 65mm Omega
2.122w H2 130 [158] 130 [159]   25mm Barr,
wedged
2.12 H2 89 [160] 89 [161]   25mm Barr
2.12 H2 163 [162] 163 [163]   25mm Omega
2.12 H2 196 196 Yes 65mm Omega,
bad ghosts
2.08 C IV 136 [164] 136 [165]   25mm Omega
2.08 C IV 195 195 Yes 65mm Omega
2.06 He I 135 [166] 135 [167]   25mm Omega
2.06 He I 194 194 Yes 65mm Omega
2.03 cont 134 [168] 134 [169]   25mm Omega
2.03 cont 193 193 Yes 65mm Omega
1.644 [Fe II] 128 128 [170]   25mm Barr
1.28 Palpha 110 [171] 110 [172]   25mm Barr
1.257 [FeII] 111 [173] 111 [174]   25mm Barr

 

Notes on IR Filters:

* Check the ISPI pages [175] to see if the filter is currently in the ISPI Dewar.

The filters listed above have seen recent use in Tololo imagers. There are other filters available. Observers should check with the staff noted below if there is a filter or transmission curve not listed above which would be of interest.

In response to an increasing number of requests, we are starting to place digital versions of the transmission data for some of our filters here. The user should take some care to verify that the filter is valid for the instrument he or she is considering at the time of use in question. The actual filter in use will in general not be the exact filter for which we have transmission data, but rather be one of the same batch. The numbers refer to the CTIO filter ID by which the filter data is archived. In case of doubt, consult with Nicole van der Bliek, Patrice Bouchet, Bob Blum, Brooke Gregory.

10 March, 2006 [rdb]

ANDICAM Filters

Filters for ANDICAM AT 1.3-M Telescope. BVRI and JHK filters

  FILTER Plot Data file
CCD Filters KPNO-B kpno_b.pdf [176] kpno_b.txt [177]
  KPNO-V kpno_v.pdf [178] kpno_v.txt [179]
  KPNO-I kpno_i.pdf [180] kpno_i.txt [181]
Infrared Filers J-band andi_j.pdf [182] j_andi.txt [183]
  H-band andi_h.pdf [184] h_andi.txt [185]
  K-band andi_k.pdf [186] k_andi.txt [187]
Legacy Filters YALO B yalo_b.pdf [188] b_yalo.txt [189]
  YALO wide R yalo_r.pdf [190] r_yalo.txt [191]

 

Y4KCam filters

 

Position Filter Focus Offset
relative to V		 Filter
Transmission
curves
Plot Data File
2 B +25 y4kcam_b.pdf [192] y4kcam_B.txt [193]
3 V 0 y4kcam_v.pdf [194] y4kcam_V.txt [195]
4 RC -25 y4kcam_r.pdf [196] y4kcam_Rc.txt [197]
5 IC +25 y4kcam_i.pdf [198] y4kcam_Ic.txt [199]
6 U+CuSO4 +125    
8 SDSS u -50 y4kcam_sdss_u.pdf [200] sdss_u.txt [201]
9 SDSS g -25 y4kcam_sdss_g.pdf [202] sdss_g.txt [203]
10 SDSS r -50 y4kcam_sdss_r.pdf [204] sdss_r.txt [205]
11 SDSS i -25 y4kcam_sdss_i.pdf [206] sdss_i.txt [207]
12 SDSS z -70 y4kcam_sdss_z.pdf [208] sdss_z.txt [209]

 

CTIO Various Filters

D. Maturana April 28,1995, updated 29 March 1999

Warning! Many of the 2x2 interference filters are now VERY old, and are not in great shape physically (scratches, coating deteoriation etc). Passband shifts can be expected too. Filters this size vignette on all our present imaging CCD systems.

Click here [210] for tabulated transmissions of other filters where available.

FILTER
/width		 SIZ
(")		 Thick
(mm.)		 Cent.
(A.)		 fwhm
(A.)		 Trans
(%)		 FILTSET Transm curve
(.txt)		 COMMENTS
  2x2 4.22       B std PFCCD    
  2x2 3.20       I 34  PFCCD    
  2x2 4.18       V std PFCCD    
3085/75 [211] 1"d 7.27 3085 75 38.50 Comet Set 3085/75 [212]  
3510/300 [213] 2x2 9.24 3510 300 33.60 u2 Strom.set 1 3510/300 [214]  
3515/290 [215] 2x2 9.30 3517 280 35.11 u1 Strom.set 1 3515/290 [216]  
3520/300 [217] 2"d 9.63 3520 296 37.50 u Strom.set 2 3520/300 [218]  
3525/320 2x2 9.03 3525 320 36.00 u Strom.set 3    
3530/280 [219] 4x4 9.15 3530 280 37.14 u Strom. 4x4 3530/280 [220]  
3530/400 [221] 2x2 6.03 3539 386 28.01 u Gunn-T set 1 3530/400 [222]  
3570/660 2x2 8.78 3570 660 84.34 U liq.cuso4 1    
3570/660 3x3   3570 660 80.59 U liq.CuS04 Tek set#2    
3572/665 2x2 8.68 3572 665 82.50 U liq.cuso4 2    
3575/600 [223] 3x3 9.09 3575 600 74.21 U liq.CuSo4 Tek set#1 3575/600 [224]  
3575/670 2x2 8.73 3575 670 82.90 U liq.cuso4 3    
3580/610 [225] 4x4 9.32 3580 610 74.66 U Liq.Cuso4 set#1 3580/610 [226] 4mts
3590/660 2x2   3590 660 87.20 U Liq.CuSo4 4   1mt. guider box
3623/605 [227] 3x3 8.83 3623 605 67.66 U liq.CuSo4 Tek set#3 3623/605 [228]  
3650/100 [229] 1"d 6.52 3651 79  44.00 Comet Set 3650/100 [230]  
 3650/600 [231] 2x2 5.93 3641 470 34.56 U ctio ("new") 3650/600 [232]  
3700/110 [233] 2x2 4.03 3698 97 46.95   3700/110 [234] red leak (9000A)
3727/21 [235] 2x2 6.04 3735 24 30.39   3727/21 [236]  
3727/44 [237] 2x2 6.19 3728 58 33.24 H beta set 3727/44 [238] one face coated
3727/45 [239] 2x2 4.22 3727 40 28.06   3727/45 [240] ghost images?
3765/45 [241] 2x2 4.23 3770 43 24.52   3765/45 [242]  
3767/44 [243] 2x2 6.20 3765 52 34.83 H beta set 3767/44 [244] one face coated
3800/110 [245] 2x2 4.58 3797 110 34.85   3800/110 [246]  
3870/50 [247] 1"d 9.10 3877 39 25.00 Comet Set 3870/50 [248]  
3980/400 [249] 2x2 6.02 3987 398 47.95 v Gunn-T set 1 3980/400 [250]  
3986/1047 [251] 2x2 5.99 3986 1047 62.70 C Wash. set #3    
3996/1042 [252] 3x3 8.11 3996 1042 62.70 C Wash.    
4000/1030 [253] 4x4 8.45 4000 1030 62.45 C Wash.    
4060/70 [254] 1"d 8.23 4061 75 46.50 Comet Set 4060/70 [255]  
4100/160 2x2 9.73 4110 160 60.00 v Strom.set 3    
4110/190 [256] 2x2 4.79 4125 182 44.99 v Strom.set 1 4110/190 [257]  
4118/146 [258] 4x4 9.87 4118 146 52.04 v Strom. 4x4 4118/146 [259]  
4120/160 [260] 2"d 8.43 4126 172 59.11 v Strom.Set 2 4120/160 [261]  
4166/83 1"d 7.53 4167 90 63.00 DDO set    
4185/1030 [262] 4x4 5.40 4185 1030 70.44 B Harris set#1   4mts
  4x4         B Set# 2 Schmidt    
4201/1050 [263] 3x3 5.17 4200 1050 66.48 B Tek set#1    
4202/1050 [264] 3x3   4200 1050 66.16 B Tek set#2    
4203/1050 [265] 3x3 5.26 4200 1050 66.72 B Tek set#3    
4257/73 1"d 7.51 4260 77 77.00 DDO set    
4260/65 [266] 1"d 6.04 4278 70 44.50 Comet Set 4260/65 [267]  
4324/1050 [268] 2x2 4.15 4300 1050 73.00 B Harris set 1    
4324/1056 [269] 2x2 4.11 4324 1056 71.00 B Harris set 3    
4324/1156 [270] 2x2 4.05 4324 1156 72.00 B Harris set 2    
4340/980 [271] 3x3 6.38 4341 980 60.33 Harris set 1 4340/980 [272]  
4345/980 3x3 6.33 4345 980 60.85 Harris set 2    
4350/1680 [273] 2x2 4.00 4350 1680 89.14 B Tyson "J"   coated both sides
4357/1665 [274] 4x4 3.65 4357 1665 88.19 B Tyson "J"   coated both sides
4363/20 [275] 2x2 5.98 4358 19 31.16   4363/20 [276]  
4380/1086 2x2 5.75 4380 1086 77.00 B-14    
4390/1060 2x2 5.68 4390 1060 78.00 B-3    
4390/1109 2x2 5.98 4390 1109 77.00 B-15    
4410/1109 2x2 5.71 4410 1109 78.00 B-16    
4440/1125 2x2 5.68 4440 1125 79.00 B-13    
4517/76 1"d 7.59 4516 77 75.00 DDO set    
4650/190 [277] 2x2 3.56 4654 173 55.09 b Strom.set 1    
4685/44 [278] 2x2 6.08 4682 42 75.85 H beta set 4685/44 [279] one face coated
4686/15 [280] 2x2 4.72 4685 13 29.77   4686/15 [281]  
4695/15 [282] 2x2 5.54 4692 15 34.60   4695/15 [283]  
4697/196 [284] 4x4 9.85 4697 196 71.27 b Str”m. 4x4 4697/196 [285]  
4700/190 [286] 2"d 6.99 4724 190 69.12 b Strom.set 2 4700/190 [287]  
4705/175 2x2 8.18 4705 175 79.30 b Strom.set 3    
4845/65 [288] 1"d 6.18 4846 69 74.00 Comet set 4845/65 [289]  
4857/12 [290] 2x2 4.33 4858 14 51.73   4857/12 [291]  
4861/26 [292] 2"d 3.70 4854 27 56.00   4861/26 [293]  
4861/44 [294] 2x2 6.07 4858 38 78.85 H beta set 4861/44 [295] one face coated
4861/50 [296] 2x2 8.22 4872 53 58.66   4861/50 [297]  
4862/14 [298] 2x2 8.22 4860 14 66.00   4862/14 [299]  
4866/12 [300] 2x2 4.31 4859 15 48.34   4866/12 [301]  
4880/70 [302] 2x2 4.26 4888 70 64.79   4880/70 [303]  
4886/186 1"d 7.57 4890 195 76.00 DDO set    
4905/44 [304] 2x2 6.04 4899 40 77.30 H beta set 4905/44 [305] one face coated
4940/700 [306] 4x4 8.95 4920 670 93.09 Gunn g 4940/700 [307]  
4949/44 [308] 2x2 6.06 4948 46 81.80 H beta set 4949/44 [309] one face coated
4993/44 [310] 2x2 6.07 4993 40 80.65 H beta set 4993/44 [311] one face coated
5000/70 [312] 2x2 4.04 4994 77 63.41   5000/70 [313]  
5007/22 2x2 9.33 5007 20 69.65 old Fabry-Perot    
5007/44 [314] 2x2 6.19 5005 39 77.19 H beta set 5007/44 [315] one face coated
5013/14 [316] 2x2 9.61 5015 17 64.63 Old Fabry Perot 5013/14 [317] LMC Redshift
5019/50 [318] 4x4 7.83 5027 50 79.48   5019/50 [319]  
5024/15 [320] 2x2 3.46 5026 16 43.63   5024/15 [321]  internal fringes
5025/1020 [322] 2x2 8.13 5025 1020 82.87 M Wash. set#3    
5025/1023 [323] 3x3 8.08 5025 1023 88.60 M Wash.    
5029/43 [324] 2x2 3.92 5030 46 42.07 Rutgers F-P 5029/43 [325]  
5032/15 [326] 2x2 5.56 5032 15 41.50   5032/15 [327] internal fringes
5037/44 [328] 2x2 6.05 5036 39 83.59 H beta set 5037/44 [329] one face coated
5040/15 [330] 2x2 5.60 5038 16 36.58   5040/15 [331]  
5040/990 [332] 4x4 8.25 5040 990 88.23 M Wash. 5040/990 [333]  
5049/15 [334] 2x2 5.56 5049 14 38.15   5049/15 [335] internal fringes
5057/15 [336] 2x2 5.57 5057 14 39.28   5057/15 [337] internal fringes
5081/44 [338] 2x2 6.03 5083 39 82.41 H beta set 5081/44 [339] one face coated
5100/100 [340] 1x1 5.16 5098 88 61.00   5100/100 [341] 3/4"d usefull
5117/895 [342] 2x2 5.07 5117 895 81.39 g Gunn-T set 2 5117/895 [343]  
5118/900 [344] 3x3 5.05 5118 900 81.39 g Gunn-T 5118/900 [345]  
5125/44 [346] 2x2 6.03 5116 40 81.87 H beta set 5125/44 [347] one face coated
5130/155 [348] 4x4 7.76 5121 133 84.13 DDO 51 Wash. set    
5140/90 [349] 1"d 6.19 5137 87 62.00 Comet set    
5140/153 [350] 2"d 9.36 5140 153 88.84 DDO51-1   in Wash set#3
5145/30 [351] 2x2   5145 30 56.84 Rutgers F-P    
5145/80 [352] 2x2 4.40 5152 80 60.69 3c    
5169/44 [353] 2x2 6.07 5161 44 79.58 H beta set   one face coated
5182/10 [354] 2x2   5175 12 52.71 Rutgers F-P    
5200/95 3/4 3.93 5187 95 64.00     round filter
5213/44 [355] 2x2 6.05 5213 44 78.20 H beta set   one face coated
5257/44 [356] 2x2 6.03 5259 44 79.34 H beta set   one face coated
5295/1590 [357] 4x4 5.24 5292 1625 90.66 HST "V"   thin film coating
5362/895 3x3 6.14 5362 895 76.80 V Harris set 1    
5370/900 3x3 6.18 5370 900 75.64 V Harris set 2    
5378/1018 [358] 2x2 3.97 5378 1018 91.00 V Harris set 3    
5380/1000 [359] 2x2 4.04 5380 1000 91.00 V Harris set 1    
5400/100 [360] 2x2 5.57 5415 114 46.58      
5409/948 [361] 2x2 4.10 5409 948 90.50 V Harris set 2    
 5435/1081 [362] 2x2 5.72 5435 1081 72.00 V-14    
5438/1026 [363] 3x3   5438 1026 91.91 V Tek set#2    
5443/1060 [364] 4x4 5.12 5443 1060 88.50 V Harris set#1   4mts
  4x4         V set#2 Schmidt    
5460/1118 2x2 5.72 5465 1118 74.60 V-16    
5461/100 [365] 1x1 3.71 5447 96 55.00      
5470/1114 2x2 5.69 5470 1114 74.00 V-15    
5475/1000 [366] 3x3   5475 1000 87.71 V Tek set#1    
5497/241 [367] 4x4 9.74 5478 244 70.83 y Strom. 4x4    
5500/200 [368] 2x2 3.51 5514 224 62.76 y Strom.set 1    
5500a240 [369] 2"d 7.63 5513 238 74.45 y Strom.set 2    
 5500b240 2x2 8.82 5500 260 80.00 y Strom.set 3    
5588/1127 3x3 5.09 5588 1127 89.44 V Tek set#3    
5755/20 [370] 2x2 6.03 5758 20 60.19      
5800/100 [371] 2x2 5.55 5796 108 56.35      
5850/1300 2x2 6.08     86.00      
 5877/14 [372] 2x2 9.36 5877 16 75.62 old Fabry-Perot    
5890/40 [373] 2"d 8.05 5890 39 74.12 Rutgers F-P    
5894/14 [374] 2x2 5.79 5889 16 56.87 Rutgers F-P    
5900/350 [375] 2x2 6.09 5924 268 62.01 x Gunn-T set 1    
5915/40 [376] 2"d 6.77 5917 38 83.00 Rutgers F-P    
5950/40 [377] 2"d 7.43 5950 44 79.4 Rutgers F-P    
5997/40 [378] 2"d 7.94 5994 40 74.8 Rutgers F-P    
6087/40 [379] 2x2 7.94 6084 42 71.40 Rutgers F-P    
6100/100 [380] 2x2 5.12 6101 103 53.66      
6120/140 [381] 3x3 7.97 6115 135 85.89 Supernova    
6130/590 [382] 4x4 8.35 6130 590 56.19 T1 Wash   .9% leak at 1.2u.
6152/625 [383] 3x3 8.21 6152 625 58.06 T1 Wash   1% leak at 1.0u.
6170/590 [384] 2x2 5.07 6170 590 50.88 T1 Wash. set#3   1% leak at 1.0u.
6301/10 [385] 2x2 10.98 6294 13 75.00 old Fabry-Perot    
6330/100 [386] 1"d 5.03 6342 93 65.15 633fs10-25   fringes
6400/1450 [387] 3x3   6400 1450 81.09 R Tek set#2    
6410/1470 [388] 3x3 5.23 6410 1470 81.76 R Tek set#3    
6420/1180 2x2 5.64 6420 1180 68.00 R-13    
6425/1500 [389] 3x3 5.25 6425 1500 79.69 R Tek set#1    
6437/1525 [390] 4x4 5.22 6437 1525 81.38 R Harris set#1   4mts
  4x4         R set #2 Schmidt    
6440/1520 [391] 2x2 3.98 6440 1520 86.00 R Harris set 1    
6454/1451 [392] 2x2 3.98 6454 1451 85.00 R Harris set 2    
6465/1300 2x2 5.64 6465 1300 57.00 R-10   bubbles
6475/1600 3x3 6.18 6475 1600 81.70 R Harris set 1    
6477/1235 2x2  5.80 6477 1235 59.74 R-11   broken corner
6477/75 [393] 2x2 6.12 6484 77 83.20 H alfa set    
6484/1532 [394] 2x2 4.06 6484 1532 86.00 R Harris set 3    
6493/1445 3x3 6.15 6493 1445 77.00 R Harris set 2    
6500/1330 2x2 3.00 6500 1330 92.00 R 33  PFCCD    
6510/1300 2x2 3.02 6510 1300 90.00 R 34  PFCCD    
6520/76 [395] 2x2 6.15 6530 71 81.09 H alfa set    
6552/40 [396] 2"d 6.63       Rutgers F-P    
6559/5 [397] 2x2 9.08 6557 7 56.12 old Fabry-Perot    
6560/110 [398] 2x2 3.91 6591 118 62.28 Corion    
 6560/900 [399] 4x4 9.19 6495 900 94.95 Gunn r    
6563/110 2x2 4.10 6562 120 62.66 3C    
6563/12 [400] 2"d 7.62 6563 11 66.55 Rutgers F-P    
6563/16 1x1 6.18 6573 15 79.00      
6563/17 [401] 2x2 9.50 6560 20 77.41 old Fabry-Perot   bad corner
656375-3 [402] 3x3 5.61 6559 64 89.37      
656375-4 [403] 4x4 5.54 6567 68 82.32      
6563/78 [404] 2x2 6.11 6568 68 82.36 H alfa set    
6563/85 1x1 6.15 6586 103 83.00     bad corner
6568/20 [405] 2x2 5.61 6568 19 69.81 H alfa narrow   both faces coated
6571/15 [406] 2"d 6.01 6571 16 72.21 Rutgers F-P    
6575/14 [407] 2x2 12.33 6571 18 74.12 Old Fabry Perot   LMC Redshift
6584/15 [408] 2"d 8.00 6583 16 74.56 Rutgers F-P    
6586/20 [409] 2x2 5.60 6583 20 70.80 H alfa narrow   both faces coated
6586/40 [410] 2x2 5.38 6590 40 80.50 Rutgers F-P    
6600/100 [411] 2x2 4.74 6593 118 62.08 #1    
6600a110 2x2 4.77 6593 118 62.08 #2    
6600b110 [412] 2x2 4.46 6597 108 57.25 3c    
660075-3 [413] 3x3 5.57 6598 69 87.77      
660075-4 [414] 4x4 5.57 6600 67 84.77      
6602/20 [415] 2x2 5.74 6596 18 70.04 H alfa narrow   one face coated
6606/75 [416] 2x2 6.14 6608 70 84.30 H alfa set    
6618/20 [417] 2x2 5.72 6610 18 72.22 H alfa narrow   both faces coated
6636/20 [418] 2x2 5.71 6628 19 72.49 H alfa narrow   both faces coated
6649/76 [419] 2x2 6.15 6650 77 87.49 H alfa set    
6654/20 [420] 2x2 5.73 6645 20 76.44 H alfa narrow   both faces coated
6672/20 [421] 2x2 5.72 6661 20 72.82 H alfa narrow   both faces coated
6680/100 [422] 2x2 4.54 6687 112 87.59 CFA set    
6693/76 [423] 2x2 6.02 6693 92 87.93 H alfa set    
6700/350 [424] 2x2 6.07 6696 316 61.71 r Gunn-T set 1    
6705/5 1x1   6702 7 42.00      
6716/13 2x2 5.23 6716 13 55.00      
6718/20 [425] 2x2 6.19 6708 26 80.32 H alfa narrow   one face coated
6718/5 [426] 1x1   6719 6 46.00      
6724/34 2x2 9.33 6726 36 82.71 old Fabry-Perot    
6724/7 [427] 2x2 5.22            
6727/1015 [428] 2x2 5.04 6727 1015 93.83 r Gunn-T set 2    
6728/1000 [429] 3x3 5.05 6728 1000 93.83 r Gunn-T    
6731/13 2x2 5.27            
6731/6 [430] 2x2 10.88 6733 7 50.61 old Fabry-Perot    
6732/20 [431] 2x2 5.93 6730 26 76.93 H alfa narrow   one face coated
6732/5 1x1   6737 10 32.00      
6737/76 [432] 2x2 6.06 6746 91 86.06 H alfa set    
6738/50 [433] 4x4 7.97 6744 50 87.83      
6781/78 [434] 2x2 6.12 6785 77 78.98 H alfa set    
6820/100 [435] 2x2 4.59 6820 100 87.00 CFA set    
6826/78 [436] 2x2 6.14 6832 81 82.32 H alfa set    
6840/120 2x2 5.00 6903 130 63.40      
6840/90 [437] 1"d 5.91 6848 90 76.80 Comet set    
6850/80 2x2 4.88 6899 134 61.59      
6860/80 2x2 4.96 6888 128 62.09      
6871/78 [438] 2x2 6.00 6867 85 86.73 H alfa set    
6890/100 [439] 2x2 6.45 6890 100 83.00 CFA set    
6916/78 [440] 2x2 6.15 6916 84 82.46 H alfa set    
6961/79 [441] 2x2 6.14 6967 90 84.01 H alfa set    
7000/175 [442] 1"d 6.11 7125 175 82.00 Comet set    
7007/79 [443] 2x2 6.07 7007 81 75.00 H alfa set    
7053/79 [444] 2x2 6.14 7046 77 77.00 H alfa set    
7080/100 [445] 2x2 6.43 7080 100 83.00 CFA set    
7099/80 [446] 2x2 6.03 7101 82 78.00 H alfa set    
7146/80 [447] 2x2 6.12 7146 72 82.13 H alfa set    
7193/80 [448] 2x2 6.10 7198 65 77.14 H alfa set    
7240/75 [449] 2x2 6.06 7235 71 84.84 H alfa set    
7288/82 [450] 2x2 6.08 7280 85 84.65 H alfa set    
7336/82 [451] 2x2 6.03 7326 78 84.58 H alfa set    
7384/84 [452] 2x2 6.12 7367 87 82.25 H alfa set    
7433/84 [453] 2x2 6.09 7421 83 84.99 H alfa set    
7482/84 [454] 2x2 6.09 7469 98 83.30 H alfa set    
7500/100 [455] 2x2 4.02 7512 147 58.00      
7531/84 [456] 2x2 6.00 7532 90 80.40 H alfa set    
7580/85 [457] 2x2 6.07 7585 97 77.80 H alfa set    
7630/85 [458] 2x2 6.07 7636 85 81.53 H alfa set    
7680/84 [459] 2x2 5.95 7678 78 80.15 H alfa set    
7700/110 [460] 2x2 4.34 7708 108 64.00      
7730/85 [461] 2x2 6.04 7731 81 78.33 H alfa set    
7781/86 [462] 2x2 6.12 7774 77 74.33 H alfa set    
7832/86 [463] 2x2 6.04 7824 91 80.08 H alfa set    
7860/2000 2x2 5.14   84        
7883/86 [464] 2x2 6.12 7871 93 77.65 H alfa set    
7935/88 [465] 2x2 6.09 7926 98 75.46 H alfa set    
8067/1485 [466] 3x3 6.11 8067 1485 95.49 I kc Tek set#3    
8075/1500 [467] 3x3 6.13 8075 1500 95.53 I kc Tek set#1    
8075/1500 [467] 4x4 6.19 8075 1500 94.09 I kc set#1 4mts    
8100/110 [468] 2x2 4.03 8106 123 67.00      
8100/1500 [469] 3x3 5.08 8100 1500 93.00 i Gunn-T    
8102/1505 [470] 2x2 5.03 8102 1505 93.89  Gunn-T set 2    
8118/1415 [471] 3x3   8118 1415 96.63 I kc Tek set#2    
8120/1500 [472] 4x4 9.22 8065 1600 86.60 Gunn i    
8123/1313 [473] 2x2 7.99 8123 1313 84.30 T2 Wash. set#3    
8200/900 2x2 6.11 8186 943 90.00 i Gunn-T set 1    
8227/1865 2x2 4.62 8227 1865 71.65 I-11    
8200/1640 2x2 4.64 8200 1640 76.00 I-10    
8200/1640 2x2 4.53 8200 1640 76.00 I-13   bubble
8300/110 [474] 2x2 3.76 8306 128 61.00      
8300/2500 [475] 4x4 5.43 8310 2560 98.73 HST "I"   thin film coating
8542/18 [476] 2x2   8540 19 60.20 Rutgers F-P    
8549/25 [477] 2x2   8560 28 77.17 Rutgers F-P    
8585/100 [478] 2"d   8589 105 85.57 Rutgers F-P    
8632/100 [479] 2x2   8639 90 91.89 Rutgers F-P    
9532/20 [480] 2x2 7.10 9536 20 45.00      
9900/ n [481] 2x2              
9900/ n [482] 3x3 5.05     95.30 z Gunn-T set 2   from 8435 (45%) --->
  4x4 5.07     95.50 z Gunn-T   from 8490 (57%) --->
            z Gunn    

 

                 

mkeaneATnoao.edu

CTIO Various Filters - Transmission curves

Transmission Curves (.txt)

3615/570 [483]

3656/167 [484]

3780-181 [485]

3912-196 [486]

4054-214 [487]

4207-233 [488]

4372-255 [489]

4551-280 [490]

4650-190 [491]

4745-309 [492]

4900-650 [493]

4955-341 [494]

go back to CTIO Various [495]

 

Filters for use with 4m R-C SPec

Order blocking

Standard Schott Colored Glass Filters

"Blue" Blocking, Long-Pass Filters

    WG335
    WG345 [496]
    WG360 [497]
    GG385 [498]
    GG420 [499]
    GG455 [500]
    GG495 [501]
    OG515
    OG570 [502]
    OG590
    RG610 [503]
    RG665
    RG695 [504]

"Red" Blocking, Bandpass Filetrs

    BG23
    BG38 [505]
    BG39 [506]

Other

    Copper Sulfate (CuSO4) [507]
    Corning 9780

Michael Keane (mkeaneATnoao.edu)
Jack Baldwin (jbaldwinATnoao.edu)

Source URL (retrieved on 02/09/2013 - 00:14): http://www.ctio.noao.edu/noao/es/content/Filters

Links:
[1] http://www.ctio.noao.edu/noao/es/content/mosaic-filters
[2] http://www.ctio.noao.edu/noao/es/content/ctio-3x3-inch-and-4x4-inch-filters
[3] http://www.oceanoptics.com/
[4] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/ls550.gif
[5] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/ls550.txt
[6] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/GOR.jpg
[7] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/uv_corion.gif
[8] http://www.ctio.noao.edu/instruments/filters/index_new.html
[9] http://www.ctio.noao.edu/noao/content/IR-Filters
[10] http://irtfweb.ifa.hawaii.edu/IRrefdata/iwafdv.html
[11] http://www.noao.edu/kpno/mosaic/filters/index.html
[12] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/filter_names.txt
[13] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/vrsupermacho_0.jpg
[14] http://www.ctio.noao.edu/noao/content/u-leak
[15] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/ctiosdssu_leak.gif
[16] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/ctiosdssu.gif
[17] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/ctiosdssu.dat
[18] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/ctiosdssuleak.dat
[19] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6001.jpg
[20] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6001.ps
[21] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6001.f287.r04.txt
[22] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6002.jpg
[23] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6002.ps
[24] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6002.f287.r04.txt
[25] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6026.jpg
[26] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6026.ps
[27] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6026.f287.r04.txt
[28] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6004.jpg
[29] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6004.ps
[30] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6004.f287.r04.txt
[31] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6028.jpg
[32] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6028.ps
[33] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6028.f287.r04.txt
[34] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6027.jpg
[35] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6027.ps
[36] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/VRsupermacho.jpg
[37] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6027.f287.r04.txt
[38] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6029.jpg
[39] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6029.pdf
[40] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6007.jpg
[41] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6007.ps
[42] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6007.f287.r04.txt
[43] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6008.jpg
[44] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6008.ps
[45] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6008.f287.r04.txt
[46] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6012.jpg
[47] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6012.ps
[48] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6012.f287.r04.txt
[49] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6014.jpg
[50] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6014.ps
[51] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6014.f287.r04.txt
[52] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6009.jpg
[53] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6009.ps
[54] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6009.f287.r04.txt
[55] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6011.jpg
[56] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6011.ps
[57] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6011.f287.r04.txt
[58] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6013.jpg
[59] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6013.ps
[60] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6013.f287.r04.txt
[61] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6022.jpg
[62] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6022.ps
[63] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6022.f287.r04.txt
[64] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6017.jpg
[65] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6017.ps
[66] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6017.f287.r04.txt
[67] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6018.jpg
[68] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6018.ps
[69] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6018.f287.r04.txt
[70] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6019.jpg
[71] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6019.ps
[72] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6019.f287.r04.txt
[73] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6020.jpg
[74] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6020.ps
[75] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6020.f287.r04.txt
[76] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6024.jpg
[77] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6024.ps
[78] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6024.f287.r04.txt
[79] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6025.jpg
[80] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6025.ps
[81] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6025.f287.r04.txt
[82] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6006.jpg
[83] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6006.ps
[84] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6006.f287.r04.txt
[85] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6003.jpg
[86] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6003.ps
[87] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6003.f287.r04.txt
[88] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6005.jpg
[89] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/c6005.ps
[90] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/asc6005.f287.r04.txt
[91] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/96951492.gif
[92] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/82591058.gif
[93] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/7689-907.gif
[94] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/6757-684.gif
[95] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/6371-601.gif
[96] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/6027-531.gif
[97] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/5718-470.gif
[98] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/5439-420.gif
[99] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/5186-379.gif
[100] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/4955-341.gif
[101] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/4745-309.gif
[102] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/4551-280.gif
[103] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/4207-233.gif
[104] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/4054-214.gif
[105] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/3912-196.gif
[106] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/3780-181.gif
[107] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/3656-167.gif
[108] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/bg23.jpg
[109] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/bg39.jpg
[110] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/gor.jpg
[111] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/OCIW_1.TXT
[112] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/y1.png
[113] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/OCIW_2.TXT
[114] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/y2.png
[115] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/OCIW_3.TXT
[116] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/y3.png
[117] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/OCIW_7.TXT
[118] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/y7.png
[119] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/iband.txt
[120] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/iband.gif
[121] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/j_40.txt
[122] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/j_401.gif
[123] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/j_82a.txt
[124] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/j_82a1.gif
[125] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/J_183.txt
[126] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/J_183.gif
[127] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/geminiJ.dat
[128] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/geminiJ.png
[129] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/ispiJ.dat
[130] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/ispiJ.png
[131] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/ja.gif
[132] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/h_44.txt
[133] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/h_441.gif
[134] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/H_184.txt
[135] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/H_184.gif
[136] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/geminiH.dat
[137] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/geminiH.png
[138] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/ha.png
[139] http://www.ctio.noao.edu/noao/sites/default/files/instruments/filters/k_50.txt
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