CTIO FILTERS

Recent measurements

Transmission measurements made in January 2001 with our fiber optics spectrometer facility (description here).

• Warning: all 2x2" filters vignette on all our present imaging CCD systems.
• Central wavelength (Cent, noted lambda₀ on the plots) and FWHM quoted are within +/-3Å.
• Absolute transmission is measured within +/-1% (peak transmission is quoted).
• The F# columns refers to the F-ratio of the beam used for the measurement (0 is parallel light).
• A selection filter is used to separate the orders during the measurement: the information is logged in the table ('Selec Filt') for our internal reference only (1 is Corion LS550; 2 is Schott OG590; 3 is Mosaic broken Bj 5.75").
• Some of the filters measured here also have an old transmission curve in the main filter list. Click on the word "old" to see a plot of this measurement.

 

Filter	Old	Plot	Data	Size	Thick	Cent	Fwhm	Trans	F#	Selec	FiltSet	Comments/cosmetics
/width	meas			(")	(mm)	(Å)	(Å)	(%)		Filt
4861/44	old	plot	data	2x2	6.1	4864	40	77.0	0	1	H beta set	one face coated
5007/44	old	plot	data	2x2	6.2	5007	38	74.5	0	1	H beta set	one face coated
6563/78	old	plot	data	2x2	6.1	6568	68	80.4	0	2	H alpha set
6575/14	old	plot	data	2x2	12.3	6571	18	64.7	0	2	Old Fabry Perot LMC Redshift
3700/415	old	plot	data	3x3		3700	415	65.9	0	3	U Landolt liquid CuSO4 (Tek set #3 ??)
4203/1050	old	plot	data	3x3	5.3	4225	996	63.8	0	3	B Tek set#3
5588/1127		plot	data	3x3	5.1	5605	1152	79.5	0	3	V Tek set#3
6410/1470	old	plot	data	3x3	5.2	6414	1474	78.9	0	1,2	R Tek set#3
8067/1485	old	plot	data	3x3	6.1	8056	1434	90.0	0	1,2	I kc Tek set#3
3666/333		plot	data	4x4	5.1	3666	333	60.0	0	3	SDSS u
4680/1530		plot	data	4x4	5.2	4680	1530	88.3	0	1	SDSS g
6350/1347		plot	data	4x4	5.0	6350	1347	97.0	0	1,2	SDSS r
7736/1516		plot	data	4x4	5.2	7736	1516	93.0	0	2	SDSS i
9926/3198		plot	data	4x4	4.8	9926	3198	99.0	0	2	SDSS z
3727/50		plot	data	5.75	5.3	3727	49	43.5	0	1	[OII]	5mm chip in corner, median of 32 points

SCANS: 20x20mm grid of points starting 10mm from the edges. Shows spatial uniformity of coating.

Filter

Old

Plot

Data

Size

Thick

Cent

Fwhm

Trans

F#

Selec

FiltSet

Comments/cosmetics

/width

meas

(")

(mm)

(A)

(A)

(%)

Filt

3727/50

plot

5.75

5.3

3727

49

43.5

0

1

[OII]

standard deviation of transmission vs. wavelength

Written by Constanza Araujo, 1 February 2001

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