Camera shutters

[Mike Carr]

Posted to CCD-world:
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	Hi Roy

	I understand your problem with large apertures. As far as I know
there is not a good "photometric shutter" for purchase these days. If you
are not interested in photometric quality, I could come up with something
a little later (not today). 

	I have designed and built them in the past, one for Norris 
Spectrograph @ Palomar, and LRIS @ Keck 10M, and another one for Max-Planck,
Heidelberg, for a Phillips 7K X 9K and others. I know shutters, and I plan 
to design one as soon as I can find a window (time) to do it.

	It is a tremendiously difficult mechanism. It has to be a small 
footprint, short in Z depth, lightweight, fast without sending motions through
the system, easy logic to control, minimal cost, and trouble free too! This
is why there is nothing out there. But I do plan (and have been planning)
to design one in the near future. If you are interested, I will try to
remember to notify you if you like. 

	MICHAEL CARR
	SDSS Project 
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