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.)

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NOIRLab Filter Database

Filter FWHM (Å) CWL (Å) Telescope Instrument Plot Data Comments
I Nearly-Mould k1005 Nicholas U. Mayall 4-meter Telescope Mosaic I Nearly-Mould k1005
ha16 H-alpha+16nm k1013 Nicholas U. Mayall 4-meter Telescope Mosaic ha16 H-alpha+16nm k1013 ha16 H-alpha+16nm k1013 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), the CTIO 4m (f/2.9), and the WIYN 0.9m (f/7.9). At the KPNO 4m f/3.1 the properties of this filter are: CWL=6705A, FWHM=81A, PEAK TRANSMISSION=91.7%.
918R 918R_v1 k1028 Nicholas U. Mayall 4-meter Telescope Mosaic 918R 918R_v1 k1028 918R 918R_v1 k1028
454 BATC k1054 ** Nicholas U. Mayall 4-meter Telescope Mosaic 454 BATC k1054 ** 454 BATC k1054 ** 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.
802 BATC k1062 ** Nicholas U. Mayall 4-meter Telescope Mosaic 802 BATC k1062 ** 802 BATC k1062 ** 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.
OCLI K Band Filter Nicholas U. Mayall 4-meter Telescope Flamingos OCLI K Band Filter OCLI K Band Filter Cuton: 2.028 - Cutoff: 2.365
K4396 Gemini South Phoenix K4396 Start (cm-1 μm): 4355=2.296 - Stop (cm-1 μm): 4446=2.249 - Echelle order 25
z Gunn WIYN 3.5-meter Telescope Hydra SIZE: 4x4
BG23 BLANK Hydra, Hydra Schott Glass BG23 Schott Glass Filters. Purpose: Bandpass ~330-620nm Thickness: 2mm
kp1113 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1113
kp1342a KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1342a
kp1309d KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1309d
wrc4 WR CIV k1024 Nicholas U. Mayall 4-meter Telescope Mosaic wrc4 WR CIV k1024 wrc4 WR CIV k1024 Below is a plot of this filter as simulated in different f/ratio beams. At the KPNO 4m f/3.1 the properties of this filter are: CWL=5819A FWHM=42.17A PEAK TRANSMISSION=71.36%
918R 918R_v1 k1028 Nicholas U. Mayall 4-meter Telescope Mosaic 918R 918R_v1 k1028
Ud Dey custom U k1045 Nicholas U. Mayall 4-meter Telescope Mosaic Ud Dey custom U k1045 Ud Dey custom U k1045
454 BATC k1054 ** Nicholas U. Mayall 4-meter Telescope Mosaic 454 BATC k1054 ** 454 BATC k1054 **
802 BATC k1062 ** Nicholas U. Mayall 4-meter Telescope Mosaic 802 BATC k1062 ** 802 BATC k1062 **
Janos JH Band Filter Nicholas U. Mayall 4-meter Telescope Flamingos Janos JH Band Filter Janos JH Band Filter Cuton: 0.947 - Cutoff: 1.870
K4484 Gemini South Phoenix K4484 Start (cm-1 μm): 4429=2.250 - Stop (cm-1 μm): 4525=2.210 - Echelle order 25
z Gunn WIYN 3.5-meter Telescope Hydra SIZE: 3x3
SDSS i WIYN 3.5-meter Telescope Hydra SDSS i SIZE: 4x4
V set#2 Schmidt 5443/1060 SMARTS Consortium: 0.9-meter Telescope BLANK Size: 4x4
BG39 BLANK Hydra, Hydra Schott Glass BG39 Schott Glass Filters. Purpose: Bandpass ~350-580nm Thickness: 2mm
C Washington k1006 Nicholas U. Mayall 4-meter Telescope Mosaic C Washington k1006 C Washington k1006 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), the CTIO 4m (f/2.9), and the WIYN 0.9m (f/7.9). At the KPNO 4m f/3.1 the properties of this filter are: CWL=3892A, FWHM=1030A, PEAK TRANSMISSION=77.4%.
O3 OIII N2 k1014 * Nicholas U. Mayall 4-meter Telescope Mosaic O3 OIII N2 k1014 * O3 OIII N2 k1014 * 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), the CTIO 4m (f/2.9), and the WIYN 0.9m (f/7.9). At the KPNO 4m f/3.1 the properties of this filter are: CWL=5006A, FWHM=56A, PEAK TRANSMISSION=76%.
918R 918R_v1 k1028 Nicholas U. Mayall 4-meter Telescope Mosaic 918R 918R_v1 k1028 918R 918R_v1 k1028 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=9140A, FWHM=81A, PEAK TRANSMISSION=84.7%.
493 BATC k1055 ** Nicholas U. Mayall 4-meter Telescope Mosaic 493 BATC k1055 ** 493 BATC k1055 ** 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.
848 BATC k1063 ** Nicholas U. Mayall 4-meter Telescope Mosaic 848 BATC k1063 ** 848 BATC k1063 ** 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.
Janos HK Band Filter Nicholas U. Mayall 4-meter Telescope Flamingos Janos HK Band Filter Janos HK Band Filter Cuton: 1.37 - Cutoff: 2.6
K4578 Gemini South Phoenix K4578 Start (cm-1 μm): 4525=2.210 - Stop (cm-1 μm): 4630=2.160 - Echelle order 26
Test Hydra
B set# 2 Schmidt WIYN 3.5-meter Telescope Hydra B set# 2 Schmidt SIZE: 4x4
GG385 BLANK Hydra, Hydra Schott Glass GG385 Schott Glass Filters. Purpose: Longpass > ~385nm Thickness: 2mm
U k1001 k1001, k1001frs, KPNO Mosaic Standard UBVRI and White Filters k1001, k1001frs 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.
kp1281a KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1281a
kp1309b KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1309b
kp1309c KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1309c
U k1001 Nicholas U. Mayall 4-meter Telescope Mosaic U k1001 U k1001
Bw NDWFS k1025 Nicholas U. Mayall 4-meter Telescope Mosaic Bw NDWFS k1025 Bw NDWFS k1025
815 815_v2 k1046 Nicholas U. Mayall 4-meter Telescope Mosaic 815 815_v2 k1046 815 815_v2 k1046
493 BATC k1055 ** Nicholas U. Mayall 4-meter Telescope Mosaic 493 BATC k1055 ** 493 BATC k1055 **
848 BATC k1063 ** Nicholas U. Mayall 4-meter Telescope Mosaic 848 BATC k1063 ** 848 BATC k1063 **
James Rhoads Low-background J Filter Nicholas U. Mayall 4-meter Telescope Flamingos James Rhoads Low-background J Filter Cuton: 1.050 - Cutoff: 1.385
K4667 Gemini South Phoenix K4667 Start (cm-1 μm): 4617=2.166 - Stop (cm-1 μm): 4717=2.120 - Echelle order 26
V set#2 Schmidt WIYN 3.5-meter Telescope Hydra V set#2 Schmidt SIZE: 4x4
SDSS u WIYN 3.5-meter Telescope Hydra SIZE: 4X4
KPNO-B SMARTS 1.3-meter Telescope ANDICAM KPNO-B KPNO-B CCD Filter
GG420 BLANK Hydra, Hydra Schott Glass GG420 Schott Glass Filters. Purpose: Longpass > ~420nm Thickness: 2mm
kp1113 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1113
kp1309b KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1309b

Updated on June 27, 2022, 11:32 am