Re: Continuing saga of flatfielding

[hjohnson@pluto.njcc.com (Herbert R Johnson)]

On Sat, 04 Apr 98 08:53:54 -0700, aah@nofs.navy.mil wrote:
*>  Let me give you a straw-man system.  Use a very simple flatfield system,
*>such as a light box, for every site, rather than sky flats.  As long as you
*>mount this light box in a consistent manner, then whatever gradients it
*>imposes on the flat will be the same from night to night, and it can be used
*>to remove dust and other effects.  Then have a better flatfield device that
*>is mailed from site to site that is used to find the gradients in the local
*>light box.  This solution removes the sky flat requirement, permits a cheap
*>local solution for the dynamic effects, but also does proper gradient
*>removal.
*>Arne

This topic was discussed some years ago, and at that time a flatfield box
was described for the Mark III. An agressive review of the TASS archives would
probably uncover it, and the *very informative* discussion. If a few people
asked me, I'd do the review, but my previous "reviews" have not recieved
much interest.

Herb Johnson

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