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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.
{ Please fill out and send the signed form via either email (richard.joyce@noirlab.edu), or mail (950 North Cherry Avenue # Tucson, AZ 85719) }

NOIRLab Filter Database

Filter FWHM (Å) CWL (Å) Telescope Instrument Plot Data Comments
kp1267_12 1186.00 6450.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1267_12 mould system R
kp1267_14 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1267_14
kp1113 1507.00 6524.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1113 bessell system k p
kp1276a KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1276a
kp1346 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1346
kp373 1051.00 6757.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter gunn set kp coated rg-630
kp7336b 78.00 7333.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter halpha set combined
kp1342a 1539.00 8079.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1342a gunn set combined A `i' from sp tel
kp1309d KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1309d
kp1314b 2006.00 8291.00 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1314b nearly mould I-omega
kp1001 KPNO 2.1-meter Telescope KPNO 2-Inch Filter kp1001
Stromgren u 278.00 3537.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters Stromgren u Stromgren u UG11+WG345
Harris B 1069.00 4312.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters Harris B Harris B new 7/98
Washington c48 200.00 4898.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters Washington c48 Washington c48 Washington set, property of Doug Welch, McMaster Univ
Harris set V- spare 1015.00 5417.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters Harris set V- spare Harris set V- spare
Harris R 1559.00 6531.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters Harris R Harris R Not available
H-alpha +31nm 76.00 6877.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters H-alpha +31nm H-alpha +31nm set1
Osmer/Green 8600 690.00 8642.00 KPNO 2.1-meter Telescope KPNO 4-Inch Filters Osmer/Green 8600 Osmer/Green 8600 Green 8600
KP1497 77.75 6780.91 Nicholas U. Mayall 4-meter Telescope KOSMOS KP1497 KP1497 KOSMOS Approved KPNO 4in. Filter.
GG-375 0.00 0.00 Nicholas U. Mayall 4-meter Telescope RC Spectrograph GG-375 GG-375 Sharp-Cut Filter. Cutoff filter: no transmission peak, FWHM is undefined.
I Nearly-Mould k1005 Nicholas U. Mayall 4-meter Telescope Mosaic I Nearly-Mould k1005
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%.
wrc4 WR CIV k1024 41.79 5828.71 Nicholas U. Mayall 4-meter Telescope Mosaic wrc4 WR CIV k1024 wrc4 WR CIV k1024 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.
918R 918R_v1 k1028 Nicholas U. Mayall 4-meter Telescope Mosaic 918R 918R_v1 k1028 918R 918R_v1 k1028
Ud Dey custom U k1045 329.76 3485.23 Nicholas U. Mayall 4-meter Telescope Mosaic Ud Dey custom U k1045 Ud Dey custom U k1045 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.
454 BATC k1054 ** Nicholas U. Mayall 4-meter Telescope Mosaic 454 BATC k1054 ** 454 BATC k1054 ** 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.
802 BATC k1062 ** Nicholas U. Mayall 4-meter Telescope Mosaic 802 BATC k1062 ** 802 BATC k1062 ** 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.
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.
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
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
KP1498 74.96 6823.53 Nicholas U. Mayall 4-meter Telescope KOSMOS KP1498 KP1498 KOSMOS Approved KPNO 4in. Filter.
GG-385 0.00 0.00 Nicholas U. Mayall 4-meter Telescope RC Spectrograph GG-385 GG-385 Sharp-Cut Filter. Cutoff filter: no transmission peak, FWHM is undefined.
C Washington k1006 1034.00 3860.00 Nicholas U. Mayall 4-meter Telescope Mosaic C Washington k1006 C Washington k1006 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.
O3 OIII N2 k1014 * 55.55 5024.90 Nicholas U. Mayall 4-meter Telescope Mosaic O3 OIII N2 k1014 * O3 OIII N2 k1014 * 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.
wrc4 WR CIV k1024 Nicholas U. Mayall 4-meter Telescope Mosaic wrc4 WR CIV k1024 wrc4 WR CIV k1024 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=5819A FWHM=42.17A PEAK TRANSMISSION=71.36%
918R 918R_v1 k1028 Nicholas U. Mayall 4-meter Telescope Mosaic 918R 918R_v1 k1028
Ud Dey custom U k1045 Nicholas U. Mayall 4-meter Telescope Mosaic Ud Dey custom U k1045 Ud Dey custom U k1045
454 BATC k1054 ** Nicholas U. Mayall 4-meter Telescope Mosaic 454 BATC k1054 ** 454 BATC k1054 **
802 BATC k1062 ** Nicholas U. Mayall 4-meter Telescope Mosaic 802 BATC k1062 ** 802 BATC k1062 **
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.
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
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
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 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.
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Updated on June 27, 2022, 11:32 am