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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
H-band SMARTS 1.3-meter Telescope ANDICAM H-band H-band Infrared Filer
H-beta narrow 25.00 4876.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters H-beta narrow H-beta narrow
H-beta wide 173.00 4871.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters H-beta wide H-beta wide
H1 + 2 blocker, Yale H1 +2 blcoker 472.00 1622.00 Nicholas U. Mayall 4-meter Telescope NEWFIRM Use with 3101, 3102, 3201, 3202
H1, Yale H1 174.70 1555.70 Nicholas U. Mayall 4-meter Telescope NEWFIRM Use with 3203
H2 314.00 21220.00 Gemini North GNIRS H2 H2
H2 310.00 21160.00 SOAR Telescope SPARTAN IR Width [km/s]: 4380. Note that SPARTAN filters are permanently mounted in the instrument, and therefore are always available and need not be specified in Instrument Setup forms.
H2 21262.00 Víctor M. Blanco 4-meter Telescope ISPI ISPI Narrow Band Filters. Wavelengths @80% (micron): 2,125 - 2,146
H2 & continuum 2.25 mu 22570.00 Víctor M. Blanco 4-meter Telescope ISPI ISPI Narrow Band Filters. Wavelengths @80% (micron): 2,2428 - 2,2618
H2 S(1) 216.00 2117.00 WIYN 3.5-meter Telescope WHIRC H2 S(1)
H2, Yale H2 168.30 1705.90 Nicholas U. Mayall 4-meter Telescope NEWFIRM Use with 3204
H2(1-0)_G1121 293.00 21220.00 Gemini South GSAOI H2(1-0)_G1121 H2(1-0)_G1121
H2(2-1)_G1123 314.00 22480.00 Gemini South GSAOI H2(2-1)_G1123 H2(2-1)_G1123
H20_G1119 734.00 20000.00 Gemini South GSAOI H20_G1119 H20_G1119
H210 318.00 21239.00 Gemini North NIRI H210 H210
H221 358.00 22465.00 Gemini North NIRI H221 H221
H2O 1569.00 30500.00 Gemini North NIRI H2O H2O
H2O_2045 1701.00 20450.00 Gemini North NIRI H2O_2045 H2O_2045
H6073 Gemini South Phoenix H6073 Start (cm-1 μm): 6017=1.662 - Stop (cm-1 μm): 6129=1.632 - Echelle order 34
H6420 Gemini South Phoenix H6420 Start (cm-1 μm): 6377=1.568 - Stop (cm-1 μm): 6464=1.547 - Echelle order 36
ha H-alpha c6009 80.00 6563.00 Nicholas U. Mayall 4-meter Telescope Mosaic ha H-alpha c6009 ha H-alpha c6009 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.
ha H-alpha k1009 80.62 6574.74 Nicholas U. Mayall 4-meter Telescope Mosaic ha H-alpha k1009 ha H-alpha k1009 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.
ha H-alpha k1009 Nicholas U. Mayall 4-meter Telescope Mosaic ha H-alpha k1009 ha H-alpha k1009 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=6550A, FWHM=80A, PEAK TRANSMISSION=93.7%.
Ha_G0310 72.00 6560.00 Gemini North GMOS-N Ha_G0310 Ha_G0310
Ha_G0336 71.00 6560.00 Gemini South GMOS-S Ha_G0336 Ha_G0336
ha12 H-alpha+12nm k1012 82.95 6698.53 Nicholas U. Mayall 4-meter Telescope Mosaic ha12 H-alpha+12nm k1012 ha12 H-alpha+12nm k1012 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.
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%.
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.
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%.
ha4 H-alpha+4nm k1010 80.48 6620.52 Nicholas U. Mayall 4-meter Telescope Mosaic ha4 H-alpha+4nm k1010 ha4 H-alpha+4nm k1010 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.
ha4 H-alpha+4nm k1010 Nicholas U. Mayall 4-meter Telescope Mosaic ha4 H-alpha+4nm k1010 ha4 H-alpha+4nm k1010 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=6593A, FWHM=81A, PEAK TRANSMISSION=91.1%.
ha8 H-alpha+8nm c6011 80.00 6650.00 Nicholas U. Mayall 4-meter Telescope Mosaic ha8 H-alpha+8nm c6011 ha8 H-alpha+8nm c6011 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.
ha8 H-alpha+8nm k1011 81.33 6654.19 Nicholas U. Mayall 4-meter Telescope Mosaic ha8 H-alpha+8nm k1011 ha8 H-alpha+8nm k1011 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.
ha8 H-alpha+8nm k1011 Nicholas U. Mayall 4-meter Telescope Mosaic ha8 H-alpha+8nm k1011 ha8 H-alpha+8nm k1011 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=6634A, FWHM=81A, PEAK TRANSMISSION=89.2%.
HaC_G0311 69.00 6620.00 Gemini North GMOS-N HaC_G0311 HaC_G0311
HaC_G0337 70.00 6620.00 Gemini South GMOS-S HaC_G0337 HaC_G0337
Hale-Bopp Blue Continuum 62.00 4449.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters
Hale-Bopp C2 117.00 5136.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters
Hale-Bopp C3 57.00 4061.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters
Hale-Bopp CN 57.00 3871.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters
Hale-Bopp CO 56.00 4265.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters
Hale-Bopp Green Continuum 55.00 5261.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters
Hale-Bopp H2O 177.00 7021.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters
Hale-Bopp NH 55.00 3362.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters
Hale-Bopp OH 57.00 3095.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters
Hale-Bopp Red Continuum 60.00 7134.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters
Hale-Bopp UVC 78.00 3448.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters
Halpha 64.00 6559.00 WIYN 3.5-meter Telescope Hydra Halpha SIZE: 3x3-5.61mm.
Halpha 68.00 6567.00 WIYN 3.5-meter Telescope Hydra Halpha SIZE: 4x4-5.54mm.
Halpha 64.00 6559.00 WIYN 3.5-meter Telescope Hydra Halpha SIZE: 3x3-5.61mm.
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Updated on June 27, 2022, 11:32 am