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.
FILTER SIZ Thick Cent. fwhm Trans FILTSET COMMENTS
/width (") (mm.) (A.) (A.) (%)
2x2 4.22 B std PFCCD
2x2 3.20 I 34 PFCCD
2x2 4.18 V std PFCCD
3085/75 1"d 7.27 3085 75 38.50 Comet Set
3510/300 2x2 9.24 3510 300 33.60 u2 Strom.set 1
3515/290 2x2 9.30 3517 280 35.11 u1 Strom.set 1
3520/300 2"d 9.63 3520 296 37.50 u Strom.set 2
3525/320 2x2 9.03 3525 320 36.00 u Strom.set 3
3530/280 4x4 9.15 3530 280 37.14 u Str”m. 4x4
3530/400 2x2 6.03 3539 386 28.01 u Gunn-T set 1
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 3x3 9.09 3575 600 74.21 U liq.CuSo4 Tek set#1
3575/670 2x2 8.73 3575 670 82.90 U liq.cuso4 3
3580/610 4x4 9.32 3580 610 74.66 U Liq.Cuso4 set#1 4mts
3590/660 2x2 3590 660 87.20 U Liq.CuSo4 4 1mt. guider box
3623/605 3x3 8.83 3623 605 67.66 U liq.CuSo4 Tek set#3
3650/100 1"d 6.52 3651 79 44.00 Comet Set
3650/600 2x2 5.93 3641 470 34.56 U ctio ("new")
3700/110 2x2 4.03 3698 97 46.95 red leak (9000A)
3727/21 2x2 6.04 3735 24 30.39
3727/44 2x2 6.19 3728 58 33.24 H beta set one face coated
3727/45 2x2 4.22 3727 40 28.06 ghost images?
3765/45 2x2 4.23 3770 43 24.52
3767/44 2x2 6.20 3765 52 34.83 H beta set one face coated
3800/110 2x2 4.58 3797 110 34.85
3870/50 1"d 9.10 3877 39 25.00 Comet Set
3980/400 2x2 6.02 3987 398 47.95 v Gunn-T set 1
3986/1047 2x2 5.99 3986 1047 62.70 C Wash. set #3
3996/1042 3x3 8.11 3996 1042 62.70 C Wash.
4000/1030 4x4 8.45 4000 1030 62.45 C Wash.
4060/70 1"d 8.23 4061 75 46.50 Comet Set
4100/160 2x2 9.73 4110 160 60.00 v Strom.set 3
4110/190 2x2 4.79 4125 182 44.99 v Strom.set 1
4118/146 4x4 9.87 4118 146 52.04 v Str”m. 4x4
4120/160 2"d 8.43 4126 172 59.11 v Strom.Set 2
4166/83 1"d 7.53 4167 90 63.00 DDO set
4185/1030 4x4 5.40 4185 1030 70.44 B Harris set#1 4mts
4x4 B Set# 2 Schmidt
4201/1050 3x3 5.17 4200 1050 66.48 B Tek set#1
4202/1050 3x3 4200 1050 66.16 B Tek set#2
4203/1050 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 1"d 6.04 4278 70 44.50 Comet Set
4324/1050 2x2 4.15 4300 1050 73.00 B Harris set 1
4324/1056 2x2 4.11 4324 1056 71.00 B Harris set 3
4324/1156 2x2 4.05 4324 1156 72.00 B Harris set 2
4340/980 3x3 6.38 4341 980 60.33 B Harris set 1
4345/980 3x3 6.33 4345 980 60.85 B Harris set 2
4350/1680 2x2 4.00 4350 1680 89.14 B Tyson "J" coated both sides
4357/1665 4x4 3.65 4357 1665 88.19 B Tyson "J" coated both sides
4363/20 2x2 5.98 4358 19 31.16
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 2x2 3.56 4654 173 55.09 b Strom.set 1
4685/44 2x2 6.08 4682 42 75.85 H beta set one face coated
4686/15 2x2 4.72 4685 13 29.77
4695/15 2x2 5.54 4692 15 34.60
4697/196 4x4 9.85 4697 196 71.27 b Str”m. 4x4
4700/190 2"d 6.99 4724 190 69.12 b Strom.set 2
4705/175 2x2 8.18 4705 175 79.30 b Strom.set 3
4845/65 1"d 6.18 4846 69 74.00 Comet set
4857/12 2x2 4.33 4858 14 51.73
4861/26 2"d 3.70 4854 27 56.00
4861/44 2x2 6.07 4858 38 78.85 H beta set one face coated
4861/50 2x2 8.22 4872 53 58.66
4862/14 2x2 8.22 4860 14 66.00
4866/12 2x2 4.31 4859 15 48.34
4880/70 2x2 4.26 4888 70 64.79
4886/186 1"d 7.57 4890 195 76.00 DDO set
4905/44 2x2 6.04 4899 40 77.30 H beta set one face coated
4940/700 4x4 8.95 4920 670 93.09 Gunn g
4949/44 2x2 6.06 4948 46 81.80 H beta set one face coated
4993/44 2x2 6.07 4993 40 80.65 H beta set one face coated
5000/70 2x2 4.04 4994 77 63.41
5007/22 2x2 9.33 5007 20 69.65 old Fabry-Perot
5007/44 2x2 6.19 5005 39 77.19 H beta set one face coated
5013/14 2x2 9.61 5015 17 64.63 Old Fabry Perot LMC Redshift
5019/50 4x4 7.83 5027 50 79.48
5024/15 2x2 3.46 5026 16 43.63 internal fringes
5025/1020 2x2 8.13 5025 1020 82.87 M Wash. set#3
5025/1023 3x3 8.08 5025 1023 88.60 M Wash.
5029/43 2x2 3.92 5030 46 42.07 Rutgers F-P
5032/15 2x2 5.56 5032 15 41.50 internal fringes
5037/44 2x2 6.05 5036 39 83.59 H beta set one face coated
5040/15 2x2 5.60 5038 16 36.58
5040/990 4x4 8.25 5040 990 88.23 M Wash.
5049/15 2x2 5.56 5049 14 38.15 internal fringes
5057/15 2x2 5.57 5057 14 39.28 internal fringes
5081/44 2x2 6.03 5083 39 82.41 H beta set one face coated
5100/100 1x1 5.16 5098 88 61.00 3/4"d usefull
5117/895 2x2 5.07 5117 895 81.39 g Gunn-T set 2
5118/900 3x3 5.05 5118 900 81.39 g Gunn-T
5125/44 2x2 6.03 5116 40 81.87 H beta set one face coated
5130/155 4x4 7.76 5121 133 84.13 DDO 51 Wash. set
5140/90 1"d 6.19 5137 87 62.00 Comet set
5140/153 2"d 9.36 5140 153 88.84 DDO51-1 in Wash set#3
5145/30 2x2 5145 30 56.84 Rutgers F-P
5145/80 2x2 4.40 5152 80 60.69 3c
5169/44 2x2 6.07 5161 44 79.58 H beta set one face coated
5182/10 2x2 5175 12 52.71 Rutgers F-P
5200/95 3/4 3.93 5187 95 64.00 round filter
5213/44 2x2 6.05 5213 44 78.20 H beta set one face coated
5257/44 2x2 6.03 5259 44 79.34 H beta set one face coated
5295/1590 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 2x2 3.97 5378 1018 91.00 V Harris set 3
5380/1000 2x2 4.04 5380 1000 91.00 V Harris set 1
5400/100 2x2 5.57 5415 114 46.58
5409/948 2x2 4.10 5409 948 90.50 V Harris set 2
5435/1081 2x2 5.72 5435 1081 72.00 V-14
5438/1026 3x3 5438 1026 91.91 V Tek set#2
5443/1060 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 1x1 3.71 5447 96 55.00
5470/1114 2x2 5.69 5470 1114 74.00 V-15
5475/1000 3x3 5475 1000 87.71 V Tek set#1
5497/241 4x4 9.74 5478 244 70.83 y Str”m. 4x4
5500/200 2x2 3.51 5514 224 62.76 y Strom.set 1
5500a240 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 2x2 6.03 5758 20 60.19
5800/100 2x2 5.55 5796 108 56.35
5850/1300 2x2 6.08 86.00
5877/14 2x2 9.36 5877 16 75.62 old Fabry-Perot
5890/40 2"d 8.05 5890 39 74.12 Rutgers F-P
5894/14 2x2 5.79 5889 16 56.87 Rutgers F-P
5900/350 2x2 6.09 5924 268 62.01 x Gunn-T set 1
5915/40 2"d 6.77 5917 38 83.00 Rutgers F-P
5950/40 2"d 7.43 5950 44 79.4 Rutgers F-P
5997/40 2"d 7.94 5994 40 74.8 Rutgers F-P
6087/40 2x2 7.94 6084 42 71.40 Rutgers F-P
6100/100 2x2 5.12 6101 103 53.66
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.
6170/590 2x2 5.07 6170 590 50.88 T1 Wash. set#3 1% leak at 1.0u.
6301/10 2x2 10.98 6294 13 75.00 old Fabry-Perot
6330/100 1"d 5.03 6342 93 65.15 633fs10-25 fringes
6400/1450 3x3 6400 1450 81.09 R Tek set#2
6410/1470 3x3 5.23 6410 1470 81.76 R Tek set#3
6420/1180 2x2 5.64 6420 1180 68.00 R-13
6425/1500 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
4x4 R set #2 Schmidt
6440/1520 2x2 3.98 6440 1520 86.00 R Harris set 1
6454/1451 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 2x2 6.12 6484 77 83.20 H alfa set
6484/1532 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 2x2 6.15 6530 71 81.09 H alfa set
6552/40 2"d 6.63 Rutgers F-P
6559/5 2x2 9.08 6557 7 56.12 old Fabry-Perot
6560/110 2x2 3.91 6591 118 62.28 Corion
6560/900 4x4 9.19 6495 900 94.95 Gunn r
6563/110 2x2 4.10 6562 120 62.66 3C
6563/12 2"d 7.62 6563 11 66.55 Rutgers F-P
6563/16 1x1 6.18 6573 15 79.00
6563/17 2x2 9.50 6560 20 77.41 old Fabry-Perot bad corner
656375-3 3x3 5.61 6559 64 89.37
656375-4 4x4 5.54 6567 68 82.32
6563/78 2x2 6.11 6568 68 82.36 H alfa set
6563/85 1x1 6.15 6586 103 83.00 bad corner
6568/20 2x2 5.61 6568 19 69.81 H alfa narrow both faces coated
6571/15 2"d 6.01 6571 16 72.21 Rutgers F-P
6575/14 2x2 12.33 6571 18 74.12 Old Fabry Perot LMC Redshift
6584/15 2"d 8.00 6583 16 74.56 Rutgers F-P
6586/20 2x2 5.60 6583 20 70.80 H alfa narrow both faces coated
6586/40 2x2 5.38 6590 40 80.50 Rutgers F-P
6600/100 2x2 4.74 6593 118 62.08 #1
6600a110 2x2 4.77 6593 118 62.08 #2
6600b110 2x2 4.46 6597 108 57.25 3c
660075-3 3x3 5.57 6598 69 87.77
660075-4 4x4 5.57 6600 67 84.77
6602/20 2x2 5.74 6596 18 70.04 H alfa narrow one face coated
6606/75 2x2 6.14 6608 70 84.30 H alfa set
6618/20 2x2 5.72 6610 18 72.22 H alfa narrow both faces coated
6636/20 2x2 5.71 6628 19 72.49 H alfa narrow both faces coated
6649/76 2x2 6.15 6650 77 87.49 H alfa set
6654/20 2x2 5.73 6645 20 76.44 H alfa narrow both faces coated
6672/20 2x2 5.72 6661 20 72.82 H alfa narrow both faces coated
6680/100 2x2 4.54 6687 112 87.59 CFA set
6693/76 2x2 6.02 6693 92 87.93 H alfa set
6700/350 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 2x2 6.19 6708 26 80.32 H alfa narrow one face coated
6718/5 1x1 6719 6 46.00
6724/34 2x2 9.33 6726 36 82.71 old Fabry-Perot
6724/7 2x2 5.22
6727/1015 2x2 5.04 6727 1015 93.83 r Gunn-T set 2
6728/1000 3x3 5.05 6728 1000 93.83 r Gunn-T
6731/13 2x2 5.27
6731/6 2x2 10.88 6733 7 50.61 old Fabry-Perot
6732/20 2x2 5.93 6730 26 76.93 H alfa narrow one face coated
6732/5 1x1 6737 10 32.00
6737/76 2x2 6.06 6746 91 86.06 H alfa set
6738/50 4x4 7.97 6744 50 87.83
6781/78 2x2 6.12 6785 77 78.98 H alfa set
6820/100 2x2 4.59 6820 100 87.00 CFA set
6826/78 2x2 6.14 6832 81 82.32 H alfa set
6840/120 2x2 5.00 6903 130 63.40
6840/90 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 2x2 6.00 6867 85 86.73 H alfa set
6890/100 2x2 6.45 6890 100 83.00 CFA set
6916/78 2x2 6.15 6916 84 82.46 H alfa set
6961/79 2x2 6.14 6967 90 84.01 H alfa set
7000/175 1"d 6.11 7125 175 82.00 Comet set
7007/79 2x2 6.07 7007 81 75.00 H alfa set
7053/79 2x2 6.14 7046 77 77.00 H alfa set
7080/100 2x2 6.43 7080 100 83.00 CFA set
7099/80 2x2 6.03 7101 82 78.00 H alfa set
7146/80 2x2 6.12 7146 72 82.13 H alfa set
7193/80 2x2 6.10 7198 65 77.14 H alfa set
7240/75 2x2 6.06 7235 71 84.84 H alfa set
7288/82 2x2 6.08 7280 85 84.65 H alfa set
7336/82 2x2 6.03 7326 78 84.58 H alfa set
7384/84 2x2 6.12 7367 87 82.25 H alfa set
7433/84 2x2 6.09 7421 83 84.99 H alfa set
7482/84 2x2 6.09 7469 98 83.30 H alfa set
7500/100 2x2 4.02 7512 147 58.00
7531/84 2x2 6.00 7532 90 80.40 H alfa set
7580/85 2x2 6.07 7585 97 77.80 H alfa set
7630/85 2x2 6.07 7636 85 81.53 H alfa set
7680/84 2x2 5.95 7678 78 80.15 H alfa set
7700/110 2x2 4.34 7708 108 64.00
7730/85 2x2 6.04 7731 81 78.33 H alfa set
7781/86 2x2 6.12 7774 77 74.33 H alfa set
7832/86 2x2 6.04 7824 91 80.08 H alfa set
7860/2000 2x2 5.14 84
7883/86 2x2 6.12 7871 93 77.65 H alfa set
7935/88 2x2 6.09 7926 98 75.46 H alfa set
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
8100/110 2x2 4.03 8106 123 67.00
8100/1500 3x3 5.08 8100 1500 93.00 i Gunn-T
8102/1505 2x2 5.03 8102 1505 93.89 i Gunn-T set 2
8118/1415 3x3 8118 1415 96.63 I kc Tek set#2
8120/1500 4x4 9.22 8065 1600 86.60 Gunn i
8123/1313 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 2x2 3.76 8306 128 61.00
8300/2500 4x4 5.43 8310 2560 98.73 HST "I" thin film coating
8542/18 2x2 8540 19 60.20 Rutgers F-P
8549/25 2x2 8560 28 77.17 Rutgers F-P
8585/100 2"d 8589 105 85.57 Rutgers F-P
8632/100 2x2 8639 90 91.89 Rutgers F-P
9532/20 2x2 7.10 9536 20 45.00
9900/ n 2x2 5.05 95.30 z Gunn-T set 2 from 8435 (45%) --->
9900/ n 3x3 5.07 95.50 z Gunn-T from 8490 (57%) --->
4x4 z Gunn