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