Cassegrain f/8.8 Ritchey-Chretien focus

DIAFI

Direct Imaging Auxiliary Functions Instrument

DIAFI facility filter set

Transmission as a function of wavelength data is available in both numerical and graphical from for each filter in the set of DIAFI facility filters. That data is in the Excel spreadsheet at the DIAFI filter spreadsheet (xls) link (version 2011-09-04).

The DIAFI Broad band filters

Sloan Digital Sky Survey filters: DIAFI has a full set of u’ g’ r’ i’ and z’ filters. Their transmission as a function of wavelength can be seen at this SDSS filters link.

Bessel-prescription Johnson filters: DIAFI has a full set of U B V R and I filters. Their transmission as a function of wavelength can be seen at this UBVRI filters link.

The DIAFI narrow band filters

Spectral feature z FWHM
(nm)
Central λ
(nm)
Transmission plots
H-alpha (line) 0.0 4.0 656.3 Hα-0-4nm
H-alpha (off-line) 0.0 4.0 665.3 Hα-0-4nm
H-alpha (line) 0.0033 (Virgo) 7.0 658.5 Hα-Virgo-7nm
H-alpha (off-line) 0.0033 (Virgo) 7.0 667.5 Hα-Virgo-7nm
H-alpha (line) 0.0 1.0 656.28 Hα-0-1nm
H-alpha (line) 0.0 10.0 667.3 Hα-0-1&10nm
O[III] (line) 0.05 5.5 523.2 O[III]-0.05-5.5nm

7 September 2011
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