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 2016-02-21).

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

The DIAFI narrow band filters

Spectral feature z FWHM
(nm)
Central λ
(nm)
Transmission plots Filter name
H-alpha (line) 0.0 4.0 656.3 Hα-0-4nm Halpha_656.3nm_4nm_z0
H-alpha (off-line) 0.0 4.0 665.3 Halpha_665.3nm_4nm_z0
H-alpha (line) 0.0033 7.0 658.5 Hα-7nm-set Halpha_658.5_7nm_z0.0033
H-alpha (line) 0.017 7.0 667.5 Halpha_667.5_7nm_z0.017
H-alpha (line) 0.030 7.0 676.0 Halpha_676.0_7nm_z0.030
H-alpha (line) 0.045 7.0 685.8 Halpha_685.8_7nm_z0.045
H-alpha (line) 0.0033 (Virgo) 7.0 658.5 * Hα-Virgo-7nm Halpha_658.5_7nm_z0.0033
H-alpha (off-line) 0.0033 (Virgo) 7.0 667.5 * Halpha_667.5_7nm_z0.017
H-alpha (line) 0.0 1.0 656.28 Hα-0-1nm Halpha_656.3nm_1nm_z0
H-alpha (line) 0.0 10.0 656.3 Hα-0-1&10nm Halpha_656.3nm_10nm_z0
O[III] (line) 0.05 5.5 523.2 O[III]-0.05-5.5nm OIII_523.2nm_5.5nm_z0.05

* These 'Virgo' filters are two of the 7nm FWHM filter set

24 February 2016
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