SSO 2·3m DBS Filters

These data are very far from complete. If the plots you require are not here and you obtain the data for yourself on your observing run, please pass it on to me for inclusion herein.

Melles Griot ND Filters

These filters lie in the main beam of the spectrograph and hence affect both the science CCDs and the autoguider.

We have measured optical density plots for all the Melles Griot ND filters, but they only cover the range 2000-7000Å. They will hopefully be made available on-line `at some later date' in the `In Laboratory' column below. Plots from the `In DBS' column are simply the ratio of the observed flux of a bright star with and without the filter in the beam.

Nominal Density
5500Å		 Nominal Transmittance
5500Å (%)		 Name In Laboratory
(Optical density)		 In DBS
(Transmittance)
4·00·0103 FNQ 029
3·00·1003 FNQ 027
2·01·0003 FNQ 023
1·35·0103 FNQ 019 GIF, PS
0·625·1203 FNQ 009

Many thanks to those who contributed to this documentation:
The Teldocs Consortium, Saskia Besier, Mike Bessell, Michelle Buxton, Paul Francis, Ken Freeman, Lisa Germany, David Hoadley, Helen Johnston, Lisa Kewley, Joe Liske, Sean Ryan, Elaine Sadler, Raylee Stathakis, Wilfred Walsh.

Last modified: Sat Jan 8 21:13:40 EST 2000