Marty Roesch wrote:

> I've got a question. I'm planning on getting a CCD system for my 12"
> scope and I'm trying to plan out which accessories I should be getting.
> One of the critical things I need to know is how much back focus my scope
> is capable of. Does anyone know off the top of their head, or could some
> one tell me how to measure it?
> I'm currently planning to get an SBIG ST-7 CCD camera in addition to
> a JMI NGF-S focuser and Optec Maxfield focal reducer. Later additions may
> include things like a flip mirror system, color filter wheel, and AO-7
> adaptive optics system. (Yes, I know you can't use the Maxfield with all
> this other stuff.) I know I'm going to run out of back focus at some
> point, but what's that magic number?
>
> -Marty
>
> --
> Martin & Anna Roesch
> http://24.3.17.92/mfr/index.html

Take a look at Doug Clapp's set-up - very innovative!

http://www.interlog.com/~dclapp/dougastr/proc/ao7ful.htm
--
Michael Cook

Take a bite Out of Light Pollution
Support the International Dark-Sky Association
http://www.darksky.org

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