Filter Information

Plots and data included with most lists.

Instructions for Fast Beam Simulations

Glass Filter Spectral Transmission Curves from Schott Catalog (reproduced with permission from Schott Glass Technologies, Inc.)

Filter Loan Request Form - PDF fill-in form (if using Adobe Reader).   Or, use the MS-Word version.
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NOIRLab Filter Database

Filter FWHM (Å) CWL (Å) Telescope Instrument Plot Data Comments
B Tyson "J" 1665.00 4357.00 WIYN 3.5-meter Telescope Hydra B Tyson "J" SIZE: 4x4-3.65mm.
B Tyson "J" 1665.00 4357.00 WIYN 3.5-meter Telescope Hydra B Tyson "J" SIZE: 4x4-3.65mm.
B Tyson "J" 4357/1665 1665.00 4357.00 SMARTS Consortium: 0.9-meter Telescope BLANK B Tyson "J" 4357/1665 Size: 4x4 Thick: 3.65
Barr H Band Filter Nicholas U. Mayall 4-meter Telescope Flamingos Barr H Band Filter Barr H Band Filter Cuton: 1.495 - Cutoff: 1.776
Barr J Band Filter Nicholas U. Mayall 4-meter Telescope Flamingos Barr J Band Filter Barr J Band Filter Cuton: 1.170 - Cutoff: 1.326
Barr Ks Band Filter Nicholas U. Mayall 4-meter Telescope Flamingos Barr Ks Band Filter Barr Ks Band Filter Cuton: 1.990 - Cutoff: 2.305
Bessell B 1269.00 4326.00 SOAR Telescope Goodman, SOI Bessell B Bessell B 4 x 4 Inches square filters for imaging with the Goodman HTS or with SOI (SOI can also use 3x3 inch filters without vignetting)
Bessell I 3914.00 8665.00 SOAR Telescope Goodman, SOI Bessell I Bessell I 4 x 4 Inches square filters for imaging with the Goodman HTS or with SOI (SOI can also use 3x3 inch filters without vignetting)
Bessell R 1922.00 6289.00 SOAR Telescope Goodman, SOI Bessell R Bessell R 4 x 4 Inches square filters for imaging with the Goodman HTS or with SOI (SOI can also use 3x3 inch filters without vignetting)
Bessell System k p 1175.00 5470.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters Bessell System k p Bessell System k p
Bessell U 784.00 3624.00 SOAR Telescope Goodman, SOI Bessell U Bessell U 4 x 4 Inches square filters for imaging with the Goodman HTS or with SOI (SOI can also use 3x3 inch filters without vignetting)
Bessell V 1073.00 5332.00 SOAR Telescope Goodman, SOI Bessell V Bessell V 4 x 4 Inches square filters for imaging with the Goodman HTS or with SOI (SOI can also use 3x3 inch filters without vignetting)
BG-1 1411.60 4095.26 KPNO 2.1-meter Telescope GoldCam BG-1 BG-1 Beware of red leak. Bandpass Filter.
BG-12 1411.60 4095.26 KPNO 2.1-meter Telescope GoldCam BG-12 BG-12 Beware of red leak. Bandpass Filter.
BG-38 2793.59 4879.23 Nicholas U. Mayall 4-meter Telescope RC Spectrograph BG-38 BG-38 Bandpass Filter.
BG-38-1 2657.20 4896.52 KPNO 2.1-meter Telescope GoldCam BG-38-1 BG-38-1 Beware of red leak. Bandpass Filter.
BG-38-1 2657.20 4896.52 KPNO 2.1-meter Telescope GoldCam BG-38-1 BG-38-1 Beware of red leak. Bandpass Filter.
BG-38-2 2657.20 4896.52 KPNO 2.1-meter Telescope GoldCam BG-38-2 BG-38-2 Beware of red leak. Bandpass Filter.
BG-39 2424.35 4736.60 Nicholas U. Mayall 4-meter Telescope RC Spectrograph BG-39 BG-39 Bandpass Filter.
BG-39 2359.51 4773.35 KPNO 2.1-meter Telescope GoldCam BG-39 BG-39 Beware of red leak. Bandpass Filter.
BG-39 2390.00 4679.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters BG-39 BG-39
BG12 1015.00 4299.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters BG12 BG12 1mm + GG385 2mm
BG23 BLANK Hydra, Hydra Schott Glass BG23 Schott Glass Filters. Purpose: Bandpass ~330-620nm Thickness: 2mm
BG38 2950.00 5010.00 Nicholas U. Mayall 4-meter Telescope KOSMOS BG38 BG38 Bandpass filter. For engineering purposes, not available to users.
BG39 BLANK Hydra, Hydra Schott Glass BG39 Schott Glass Filters. Purpose: Bandpass ~350-580nm Thickness: 2mm
Bj Tyson c6024 *** Not Available 1650.00 4350.00 Nicholas U. Mayall 4-meter Telescope Mosaic Bj Tyson c6024 *** Not Available Bj Tyson c6024 *** Not Available Note: The central wavelength of CTIO Mosaic narrow band filters (actually all filters, but is very significant for narrow band filters) is shifted ~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 wavelength quoted below is nominally for when the filter is used at PF, with the ~15A shift included. Furthermore, the filter transmission curve presented below shows the simulated filter transmission curve for the Blanco 4m + PFADC f/2.87 beam.
Br gamma 21648.00 Víctor M. Blanco 4-meter Telescope ISPI ISPI Narrow Band Filters. Wavelengths @80% (micron): 2,1592 - 2,1738
Br γ 215.00 2162.00 WIYN 3.5-meter Telescope WHIRC Br γ
Br γ 45 237.00 2188.00 WIYN 3.5-meter Telescope WHIRC Br γ 45
BRA 628.00 40520.00 Gemini North NIRI BRA BRA needs to be updated
BRACONT 617.00 39900.00 Gemini North NIRI BRACONT BRACONT needs to be updated
BrG_G1122 308.00 21660.00 Gemini South GSAOI BrG_G1122 BrG_G1122
BRGAMMA 338.00 21686.00 Gemini North NIRI BRGAMMA BRGAMMA
Bry 210.00 21620.00 SOAR Telescope SPARTAN IR Width [km/s]: 2870. Note that SPARTAN filters are permanently mounted in the instrument, and therefore are always available and need not be specified in Instrument Setup forms.
BTFI 5021/17 16.50 5020.90 SOAR Telescope SAM, SAM-FP
BTFI 6569 / 20 18.60 6569.20 SOAR Telescope SAM, SAM-FP
BTFI 6579 / 20 19.90 6578.80 SOAR Telescope SAM, SAM-FP
BTFI 6600 / 20 19.30 6600.50 SOAR Telescope SAM, SAM-FP
BTFI 6745 / 38 38.50 6745.00 SOAR Telescope SAM, SAM-FP
BTFI_5021/17 Narrow 16.50 5030.90 SOAR Telescope SAM, SAMI
BTFI_6569/20 BTFI 18.60 6569.20 SOAR Telescope SAM, SAMI
BTFI_6579/20 BTFI 19.90 6578.80 SOAR Telescope SAM, SAMI
BTFI_6600/20 BTFI 19.30 6600.50 SOAR Telescope SAM, SAMI
BTFI_6745/38 BTFI 38.50 6745.00 SOAR Telescope SAM, SAMI
Bw NDWFS k1025 Nicholas U. Mayall 4-meter Telescope Mosaic Bw NDWFS k1025 Bw NDWFS k1025 Below is a plot of the transmission of this filter when used at telescopes with differing focal ratios and central obscurations; the KPNO 4m (f/3.1) and the CTIO 4m (f/2.9). At the KPNO 4m f/3.1 the properties of this filter are: CWL=4091A, FWHM=1250A, PEAK TRANSMISSION=91.7%.
Bw NDWFS k1025 1275.21 4110.78 Nicholas U. Mayall 4-meter Telescope Mosaic Bw NDWFS k1025 Bw NDWFS k1025 Note that there is a shift in central wavelength when placed in different f/ratio beams. At the KPNO 4meter f/3.1 beam this corresponds to a shift of approximately 12 Angstroms bluer; at the CTIO 4meter f/2.9 this corresponds to a shift of approximately 15 Angstroms bluer; at the WIYN 0.9m f/7.9 this corresponds to a shift of approximately 5 Angstroms bluer. See the plot at the bottom of the page. Note: This filter was called the NDWFS UB filter in 1997-1998.
Bw NDWFS k1025 Nicholas U. Mayall 4-meter Telescope Mosaic Bw NDWFS k1025 Bw NDWFS k1025
C IV 2.00 Víctor M. Blanco 4-meter Telescope ISPI ISPI Narrow Band Filters. Wavelengths @80% (micron): 2,0753 - 2,0892
C Wash 1030.00 4000.00 WIYN 3.5-meter Telescope Hydra C Wash SIZE: 4x4-8.45mm.
C Wash 1030.00 4000.00 WIYN 3.5-meter Telescope Hydra C Wash SIZE: 4x4-8.45mm.