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 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 314.00 21220.00 Gemini North GNIRS H2 H2
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 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 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_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 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%.
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.
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%.
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.
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 68.00 6567.00 WIYN 3.5-meter Telescope Hydra Halpha SIZE: 4x4-5.54mm.