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
Test Hydra
U k1001 k1001, k1001frs, KPNO Mosaic Standard UBVRI and White Filters k1001, k1001frs 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.
U Harris Solid 556.00 3645.00 WIYN 0.9-meter Telescope S2KB U Harris Solid U Harris Solid 03-2004
U Harris Solid 556.00 3645.00 WIYN 0.9-meter Telescope S2KB U Harris Solid Bandpass.
B Harris 1070.00 4279.00 WIYN 0.9-meter Telescope S2KB B Harris B Harris 04-2003
V Harris 936.00 5399.00 WIYN 0.9-meter Telescope S2KB V Harris V Harris 04-2003
R Harris 1509.00 6404.00 WIYN 0.9-meter Telescope S2KB R Harris R Harris 04-2003
I Harris 2077.00 8333.00 WIYN 0.9-meter Telescope S2KB I Harris I Harris 11-2001
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.
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.
H-alpha+8nm 60.00 6658.00 WIYN 0.9-meter Telescope S2KB H-alpha+8nm H-alpha+8nm 10-2007
H-alpha+8nm 60.00 6658.00 WIYN 0.9-meter Telescope S2KB H-alpha+8nm Bandpass.
H-alpha+12nm 63.00 6700.00 WIYN 0.9-meter Telescope S2KB H-alpha+12nm H-alpha+12nm 10-2007
H-alpha+12nm 63.00 6700.00 WIYN 0.9-meter Telescope S2KB H-alpha+12nm Bandpass.
H-alpha+16nm 60.00 6742.00 WIYN 0.9-meter Telescope S2KB H-alpha+16nm H-alpha+16nm 4-2008
Stromgren u 34.00 3467.00 WIYN 0.9-meter Telescope S2KB Stromgren u Stromgren u 01-2013
Stromgren v 133.00 4117.00 WIYN 0.9-meter Telescope S2KB Stromgren v Stromgren v 01-2013
Stromgren b 207.70 4718.00 WIYN 0.9-meter Telescope S2KB Stromgren b Stromgren b 01-2013
Stromgren y 227.00 5514.00 WIYN 0.9-meter Telescope S2KB Stromgren y Stromgren y 01-2013
Hb-narrow 30.00 4854.00 WIYN 0.9-meter Telescope S2KB Hb-narrow Hb-narrow 01-2013
Hb-wide 139.00 4875.00 WIYN 0.9-meter Telescope S2KB Hb-wide Hb-wide 01-2013
Ca 96.00 3972.00 WIYN 0.9-meter Telescope S2KB Ca Ca 01-2013
wrhe2 WR HeII k1023 Nicholas U. Mayall 4-meter Telescope Mosaic wrhe2 WR HeII k1023 wrhe2 WR HeII k1023 Below is a plot of this filter as simulated in different f/ratio beams. At the KPNO 4m the properties of this filter are: CWL=4695A FWHM=51.34A PEAK TRANSMISSION=74.83%.
823 823_v2 k1047 Nicholas U. Mayall 4-meter Telescope Mosaic 823 823_v2 k1047 823 823_v2 k1047 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= 8193.49A FWHM= 68.30A PEAK TRANSMISSION= 89.71% at 8182A
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.
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%
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.
Bw NDWFS k1025 Nicholas U. Mayall 4-meter Telescope Mosaic Bw NDWFS k1025 Bw NDWFS k1025
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%.
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.
815 815_v1 k1026 Nicholas U. Mayall 4-meter Telescope Mosaic 815 815_v1 k1026 815 815_v1 k1026
815 815_v1 k1026 Nicholas U. Mayall 4-meter Telescope Mosaic 815 815_v1 k1026 A comparison of this filter with the newer version of this filter (k1046):
815 815_v1 k1026 Nicholas U. Mayall 4-meter Telescope Mosaic 815 815_v1 k1026
815 815_v1 k1026 Nicholas U. Mayall 4-meter Telescope Mosaic 815 815_v1 k1026 815 815_v1 k1026 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=8087A, FWHM=71A, PEAK TRANSMISSION=93%.
823 823_v1 k1027 70.61 8232.04 Nicholas U. Mayall 4-meter Telescope Mosaic 823 823_v1 k1027 823 823_v1 k1027 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 (k1047) was purchased. See below for a comparison of the two filters.
823 823_v1 k1027 Nicholas U. Mayall 4-meter Telescope Mosaic 823 823_v1 k1027 823 823_v1 k1027
823 823_v1 k1027 Nicholas U. Mayall 4-meter Telescope Mosaic 823 823_v1 k1027 A comparison of this filter with the newer version (k1047):
823 823_v1 k1027 Nicholas U. Mayall 4-meter Telescope Mosaic 823 823_v1 k1027
823 823_v1 k1027 Nicholas U. Mayall 4-meter Telescope Mosaic 823 823_v1 k1027 823 823_v1 k1027 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 the properties of this filter are: CWL=8170A, FWHM=71A, PEAK TRANSMISSION=91.5%.
918R 918R_v1 k1028 81.22 9210.96 Nicholas U. Mayall 4-meter Telescope Mosaic 918R 918R_v1 k1028 918R 918R_v1 k1028 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
918R 918R_v1 k1028 Nicholas U. Mayall 4-meter Telescope Mosaic 918R 918R_v1 k1028
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%.
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 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)
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):
815 815_v2 k1046 Nicholas U. Mayall 4-meter Telescope Mosaic 815 815_v2 k1046 815 815_v2 k1046
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

Updated on June 27, 2022, 11:32 am