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
823 823_v1 k1027 Nicholas U. Mayall 4-meter Telescope Mosaic 823 823_v1 k1027
Rs Steidel k1043 Nicholas U. Mayall 4-meter Telescope Mosaic Rs Steidel k1043 Rs Steidel k1043
390 BATC k1052 ** Nicholas U. Mayall 4-meter Telescope Mosaic 390 BATC k1052 ** 390 BATC k1052 **
705 BATC k1060 ** Nicholas U. Mayall 4-meter Telescope Mosaic 705 BATC k1060 ** 705 BATC k1060 **
C Washington c6029 1075.00 3850.00 Nicholas U. Mayall 4-meter Telescope Mosaic
I Nearly-Mould k1005 1914.59 8204.53 Nicholas U. Mayall 4-meter Telescope Mosaic I Nearly-Mould k1005 I Nearly-Mould k1005 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.
ha12 H-alpha+12nm k1012 Nicholas U. Mayall 4-meter Telescope Mosaic ha12 H-alpha+12nm k1012 ha12 H-alpha+12nm k1012 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=6672A, FWHM=83A, PEAK TRANSMISSION=87.3%.
wrhe2 WR HeII k1023 50.31 4702.60 Nicholas U. Mayall 4-meter Telescope Mosaic wrhe2 WR HeII k1023 wrhe2 WR HeII k1023 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.
823 823_v1 k1027 Nicholas U. Mayall 4-meter Telescope Mosaic 823 823_v1 k1027 823 823_v1 k1027 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 the properties of this filter are: CWL=8170A, FWHM=71A, PEAK TRANSMISSION=91.5%.
Us solid U k1044 588.20 3651.81 Nicholas U. Mayall 4-meter Telescope Mosaic Us solid U k1044 Us solid U k1044 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.
420 BATC k1053 ** Nicholas U. Mayall 4-meter Telescope Mosaic 420 BATC k1053 ** 420 BATC k1053 ** 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.
755 BATC k1061 ** Nicholas U. Mayall 4-meter Telescope Mosaic 755 BATC k1061 ** 755 BATC k1061 ** 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.
M Washington c6007 1020.00 5020.00 Nicholas U. Mayall 4-meter Telescope Mosaic M Washington c6007 M Washington c6007 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.
I Nearly-Mould k1005 Nicholas U. Mayall 4-meter Telescope Mosaic I Nearly-Mould k1005 I Nearly-Mould k1005
ha16 H-alpha+16nm k1013 81.10 6730.72 Nicholas U. Mayall 4-meter Telescope Mosaic ha16 H-alpha+16nm k1013 ha16 H-alpha+16nm k1013 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.
wrhe2 WR HeII k1023 Nicholas U. Mayall 4-meter Telescope Mosaic wrhe2 WR HeII k1023 wrhe2 WR HeII k1023 Below is a plot of this filter as simulated in different f/ratio beams. At the KPNO 4m the properties of this filter are: CWL=4695A FWHM=51.34A PEAK TRANSMISSION=74.83%.
918R 918R_v1 k1028 81.22 9210.96 Nicholas U. Mayall 4-meter Telescope Mosaic 918R 918R_v1 k1028 918R 918R_v1 k1028 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.
Us solid U k1044 Nicholas U. Mayall 4-meter Telescope Mosaic Us solid U k1044 Us solid U k1044
420 BATC k1053 ** Nicholas U. Mayall 4-meter Telescope Mosaic 420 BATC k1053 ** 420 BATC k1053 **
755 BATC k1061 ** Nicholas U. Mayall 4-meter Telescope Mosaic 755 BATC k1061 ** 755 BATC k1061 **
D51 DDO 51 c6008 154.00 5130.00 Nicholas U. Mayall 4-meter Telescope Mosaic D51 DDO 51 c6008 D51 DDO 51 c6008 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.
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
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
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
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
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 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 Ks Band Filter Nicholas U. Mayall 4-meter Telescope Flamingos Barr Ks Band Filter Barr Ks Band Filter Cuton: 1.990 - Cutoff: 2.305
He I 94.00 1082.00 WIYN 3.5-meter Telescope WHIRC He I
CN 168.00 1107.00 WIYN 3.5-meter Telescope WHIRC CN The Pa β 45 and CO-n filters were removed from WHIRC in January 2012 and replaced by the CN and CO-w filters.
Pa β 158.00 1280.00 WIYN 3.5-meter Telescope WHIRC Pa β
Pa β 45 133.00 1303.00 WIYN 3.5-meter Telescope WHIRC Pa β 45 The Pa β 45 and CO-n filters were removed from WHIRC in January 2012 and replaced by the CN and CO-w filters.
[Fe II] 164.00 1646.00 WIYN 3.5-meter Telescope WHIRC [Fe II]
[Fe II] 45 162.00 1668.00 WIYN 3.5-meter Telescope WHIRC [Fe II] 45
H2 S(1) 216.00 2117.00 WIYN 3.5-meter Telescope WHIRC H2 S(1)
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
CO-n 228.00 2293.00 WIYN 3.5-meter Telescope WHIRC CO-n The Pa β 45 and CO-n filters were removed from WHIRC in January 2012 and replaced by the CN and CO-w filters.
CO-w 103.00 2342.00 WIYN 3.5-meter Telescope WHIRC CO-w The Pa β 45 and CO-n filters were removed from WHIRC in January 2012 and replaced by the CN and CO-w filters.
J 162.00 1250.00 WIYN 3.5-meter Telescope WHIRC J
H 310.00 1651.00 WIYN 3.5-meter Telescope WHIRC H
Ks 343.00 2168.00 WIYN 3.5-meter Telescope WHIRC Ks
Low airglow 132.00 1060.00 WIYN 3.5-meter Telescope WHIRC Low airglow
J blocker 533.00 1322.00 Nicholas U. Mayall 4-meter Telescope NEWFIRM J blocker Use with 2101, 2102
1644 nm, 1644 17.20 1649.10 Nicholas U. Mayall 4-meter Telescope NEWFIRM 1644 nm, 1644 Use with 3302
JX 178.00 1246.00 Nicholas U. Mayall 4-meter Telescope NEWFIRM JX
1644 blocker [Fe II] blocker 451.00 1593.00 Nicholas U. Mayall 4-meter Telescope NEWFIRM 1644 blocker [Fe II] blocker Use with 3301
J1, Yale J1 160.60 1048.40 Nicholas U. Mayall 4-meter Telescope NEWFIRM Use with 2202
KS 313 315.00 2128.00 Nicholas U. Mayall 4-meter Telescope NEWFIRM Use with 3103. These filters have never been used in NEWFIRM.
J1 blocker, Yale J1 blocker 321.00 1097.00 Nicholas U. Mayall 4-meter Telescope NEWFIRM Use with 2201

Updated on June 27, 2022, 11:32 am