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[ATM] Cassegrain back focus?

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Subject: [ATM] Cassegrain back focus?
From: "Gary McKenzie" <garymck@netspace.net.au>
Date: Mon, 14 Mar 2005 16:22:21 +1100
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Hi,
Wondering what amount of back focus would be appropriate for a cassegrain
that was going to be used with a field derotator, focal reducer, 2 "
diagonal, ccd camera with filter wheel etc, etc. Obviously they are not all
goiung to be used together, but various combinations may be tried. It will
be used both visually, and for ccd imaging....

Seems that soemthing around 200-250mm or so seems OK.

What do you guys think?

Cheers
Gary

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