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Re: [ATM] Cassegrain back focus?

Subject: Re: [ATM] Cassegrain back focus?
From: "Richard F.L.R. Snashall" <rflrs@rcn.com>
Date: Mon, 14 Mar 2005 00:37:23 -0500
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Gary McKenzie wrote:

>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 is the primary diameter?

>What do you guys think?
>
>Cheers
>Gary
>
>  
>
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References:
- [ATM] Cassegrain back focus?
  - From: "Gary McKenzie" <garymck@netspace.net.au>

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