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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
U k1001 630.71 3552.00 Nicholas U. Mayall 4-meter Telescope Mosaic U k1001 U k1001 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.
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%.
Bw NDWFS k1025 1275.21 4110.78 Nicholas U. Mayall 4-meter Telescope Mosaic Bw NDWFS k1025 Bw NDWFS k1025 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. Note: This filter was called the NDWFS UB filter in 1997-1998.
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%.
815 815_v2 k1046 68.53 8152.64 Nicholas U. Mayall 4-meter Telescope Mosaic 815 815_v2 k1046 815 815_v2 k1046 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. Note: This is a replacement for the old Rhoads 815 filter (k1026)
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.
o2 OII c6012 50.00 3727.00 Nicholas U. Mayall 4-meter Telescope Mosaic o2 OII c6012 o2 OII c6012 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.
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
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.
KP1517 76.36 6866.80 Nicholas U. Mayall 4-meter Telescope KOSMOS KP1517 KP1517 KOSMOS Approved KPNO 4in. Filter.
GG-400b 0.00 0.00 Nicholas U. Mayall 4-meter Telescope RC Spectrograph GG-400b GG-400b Sharp-Cut Filter. Cutoff filter: no transmission peak, FWHM is undefined.
U k1001 Nicholas U. Mayall 4-meter Telescope Mosaic U k1001 U k1001
M Washington k1007 1140.00 5100.00 Nicholas U. Mayall 4-meter Telescope Mosaic M Washington k1007 M Washington k1007 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 plot at the bottom of the page.
Ooff OIII+30nm k1015 242.69 5317.54 Nicholas U. Mayall 4-meter Telescope Mosaic Ooff OIII+30nm k1015 Ooff OIII+30nm k1015 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 redder. See the plot at the bottom of the page.
Bw NDWFS k1025 Nicholas U. Mayall 4-meter Telescope Mosaic Bw NDWFS k1025 Bw NDWFS k1025
gd DECam k1035 *** New! 1524.00 4744.90 Nicholas U. Mayall 4-meter Telescope Mosaic gd DECam k1035 *** New! gd DECam k1035 *** New! 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.
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 **
s2 SII c6013 80.00 6725.00 Nicholas U. Mayall 4-meter Telescope Mosaic s2 SII c6013 s2 SII c6013 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.
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
J1 blocker, Yale J1 blocker 321.00 1097.00 Nicholas U. Mayall 4-meter Telescope NEWFIRM Use with 2201
KS 318 312.00 2129.00 Nicholas U. Mayall 4-meter Telescope NEWFIRM Use with 3103
BG38 2950.00 5010.00 Nicholas U. Mayall 4-meter Telescope KOSMOS BG38 BG38 Bandpass filter. For engineering purposes, not available to users.
GG-420 0.00 0.00 Nicholas U. Mayall 4-meter Telescope RC Spectrograph GG-420 GG-420 Sharp-Cut Filter. Cutoff filter: no transmission peak, FWHM is undefined.
U k1001 Nicholas U. Mayall 4-meter Telescope Mosaic U k1001
M Washington k1007 Nicholas U. Mayall 4-meter Telescope Mosaic M Washington k1007 M Washington k1007 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=5168A, FWHM=1126A, PEAK TRANSMISSION=86.5%.
Ooff OIII+30nm k1015 Nicholas U. Mayall 4-meter Telescope Mosaic Ooff OIII+30nm k1015 Ooff OIII+30nm k1015 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=5298.69A FWHM=240.20A PEAK TRANSMISSION=91.73%
Bw NDWFS k1025 Nicholas U. Mayall 4-meter Telescope Mosaic Bw NDWFS k1025 Bw NDWFS k1025 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=4091A, FWHM=1250A, PEAK TRANSMISSION=91.7%.
rd DECam k1036 *** New! 1426.90 6395.60 Nicholas U. Mayall 4-meter Telescope Mosaic rd DECam k1036 *** New! rd DECam k1036 *** New! 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.
815 815_v2 k1046 Nicholas U. Mayall 4-meter Telescope Mosaic 815 815_v2 k1046 A comparison of this filter with the older version of this filter (k1026):
527 BATC k1056 ** Nicholas U. Mayall 4-meter Telescope Mosaic 527 BATC k1056 ** 527 BATC k1056 ** 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.
918 BATC k1064 ** Nicholas U. Mayall 4-meter Telescope Mosaic 918 BATC k1064 ** 918 BATC k1064 ** 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.
o3 OIII c6014 50.00 4990.00 Nicholas U. Mayall 4-meter Telescope Mosaic o3 OIII c6014 o3 OIII c6014 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.
J2, Yale J2 152.80 1190.30 Nicholas U. Mayall 4-meter Telescope NEWFIRM Use with 2205
KXS 320.00 2150.00 Nicholas U. Mayall 4-meter Telescope NEWFIRM KXS
GG455 0.00 4565.00 Nicholas U. Mayall 4-meter Telescope KOSMOS GG455 GG455 KOSMOS dedicated blocker
GG-455 0.00 0.00 Nicholas U. Mayall 4-meter Telescope RC Spectrograph GG-455 GG-455 Sharp-Cut Filter. Cutoff filter: no transmission peak, FWHM is undefined.
B Harris k1002 993.88 4381.00 Nicholas U. Mayall 4-meter Telescope Mosaic B Harris k1002 B Harris k1002 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.
D51 DDO 51 k1008 162.90 5145.20 Nicholas U. Mayall 4-meter Telescope Mosaic D51 DDO 51 k1008 D51 DDO 51 k1008 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.
wh Bk-7 k1016 6800.00 5600.00 Nicholas U. Mayall 4-meter Telescope Mosaic wh Bk-7 k1016 wh Bk-7 k1016 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.
815 815_v1 k1026 70.36 8152.10 Nicholas U. Mayall 4-meter Telescope Mosaic 815 815_v1 k1026 815 815_v1 k1026 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. Note:In December 2003 a replacement for this filter (k1046) was purchased. See below for a comparison between the two filters.
zd DECam k1038 *** New! 1467.00 9280.00 Nicholas U. Mayall 4-meter Telescope Mosaic zd DECam k1038 *** New! zd DECam k1038 *** New! 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.
815 815_v2 k1046 Nicholas U. Mayall 4-meter Telescope Mosaic 815 815_v2 k1046 815 815_v2 k1046 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= 8109.85A FWHM= 68.62A PEAK TRANSMISSION= 81.42% at 8122A
527 BATC k1056 ** Nicholas U. Mayall 4-meter Telescope Mosaic 527 BATC k1056 ** 527 BATC k1056 **
918 BATC k1064 ** Nicholas U. Mayall 4-meter Telescope Mosaic 918 BATC k1064 ** 918 BATC k1064 **
wh Bk-7 c6016 5000.00 6500.00 Nicholas U. Mayall 4-meter Telescope Mosaic
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Updated on June 27, 2022, 11:32 am