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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.)

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
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.
H-alpha9_2 68.00 6653.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters H-alpha9_2 H-alpha9_2 =+9nm set2
kp6649a 70.00 6650.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter halpha set combined
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.
KP1494 86.37 6647.82 Nicholas U. Mayall 4-meter Telescope KOSMOS KP1494 KP1494 KOSMOS Approved KPNO 4in. Filter.
DECam N662 170.00 6622.40 Víctor M. Blanco 4-meter Telescope Dark Energy Camera DECam N662
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.
HaC_G0311 69.00 6620.00 Gemini North GMOS-N HaC_G0311 HaC_G0311
H-alpha +6nm 67.00 6620.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters H-alpha +6nm H-alpha +6nm Andover
HaC_G0337 70.00 6620.00 Gemini South GMOS-S HaC_G0337 HaC_G0337
H-alpha6_2 74.00 6618.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters H-alpha6_2 H-alpha6_2 =+6nm set2
H-alpha+4nm 60.00 6618.00 WIYN 0.9-meter Telescope S2KB H-alpha+4nm H-alpha+4nm 10-2007
H-alpha+4nm 60.00 6618.00 WIYN 0.9-meter Telescope S2KB H-alpha+4nm Bandpass.
kp6606a 71.00 6611.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter halpha set combined
KP1391 68.39 6608.47 Nicholas U. Mayall 4-meter Telescope KOSMOS KP1391 KP1391 KOSMOS Approved KPNO 4in. Filter.
kp1346 78.00 6606.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1346
BTFI_6600/20 BTFI 19.30 6600.50 SOAR Telescope SAM, SAMI
BTFI 6600 / 20 19.30 6600.50 SOAR Telescope SAM, SAM-FP
660075-4 67.00 6600.00 SMARTS Consortium: 0.9-meter Telescope BLANK 660075-4 Size: 4x4 Thick: 5.57
N/A 67.00 6600.00 WIYN 3.5-meter Telescope Hydra N/A SIZE: 4x4-5.57mm.
narrow Halpha 6600 (CTIO set) 75.00 6600.00 SOAR Telescope Goodman, SOI 4 x 4 Inches square filters for imaging with the Goodman HTS or with SOI (SOI can also use 3x3 inch filters without vignetting)
N/A 67.00 6600.00 WIYN 3.5-meter Telescope Hydra N/A SIZE: 4x4-5.57mm.
660075-3 69.00 6598.00 SMARTS Consortium: 0.9-meter Telescope BLANK 660075-3 Size: 3x3 Thick: 5.57
N/A 69.00 6598.00 WIYN 3.5-meter Telescope Hydra N/A SIZE: 3x3-5.57mm.
N/A 69.00 6598.00 WIYN 3.5-meter Telescope Hydra N/A SIZE: 3x3-5.57mm.
kp1520 16.00 6590.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1520 nebular set replaces kp256
H-alpha 72.00 6587.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters H-alpha H-alpha Andover
kp256 13.00 6586.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp256 nebular set
SAMI-[NII]6583 Narrow 18.00 6583.00 SOAR Telescope SAM, SAMI SAMI-[NII]6583 Narrow
SAMI [NII] Narrow 18.00 6583.00 SOAR Telescope SAM, SAM-FP
BTFI_6579/20 BTFI 19.90 6578.80 SOAR Telescope SAM, SAMI
BTFI 6579 / 20 19.90 6578.80 SOAR Telescope SAM, SAM-FP
KP1390 72.39 6577.44 Nicholas U. Mayall 4-meter Telescope KOSMOS KP1390 KP1390 KOSMOS Approved KPNO 4in. Filter.
kp1282 168.00 6577.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1282 h alpha replaced
H-alpha 59.00 6577.00 WIYN 0.9-meter Telescope S2KB H-alpha H-alpha 10-2007
H-alpha 59.00 6577.00 WIYN 0.9-meter Telescope S2KB H-alpha Bandpass.
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.
H-alpha_2 67.00 6573.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters H-alpha_2 H-alpha_2 set2
H-alpha 89.00 6572.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters H-alpha H-alpha Some edge deterioration
BTFI_6569/20 BTFI 18.60 6569.20 SOAR Telescope SAM, SAMI
BTFI 6569 / 20 18.60 6569.20 SOAR Telescope SAM, SAM-FP
kp1345 78.00 6569.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1345
kp810 39.00 6569.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp810 h alpha system
kp1434 29.00 6569.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1434 halpha replaces kp810
kp1281a 170.00 6568.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1281a
kp6563a 74.00 6568.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter halpha set combined
kp376 9.00 6567.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp376 backup for 795 janos
Halpha 656375-4 68.00 6567.00 SMARTS Consortium: 0.9-meter Telescope BLANK Halpha 656375-4 Size: 4x4 Thick: 5.54
H-alpha 84.00 6567.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters H-alpha H-alpha Andover [set1?]
Halpha 68.00 6567.00 WIYN 3.5-meter Telescope Hydra Halpha SIZE: 4x4-5.54mm.
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Updated on June 27, 2022, 11:32 am