Marty Roesch wrote:

> ... One of the critical things I need to know is how much back focus
> my scope is capable of. ...
> 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.

The Meade SCT will come to focus with the NGF-S + AO + ST-7. I don't
know if it will all work with the CFW, but I suspect that it will.

But you may not want to use all at once. (1) At f/10 tri-colour
becomes and endurance test. You will likely want to use the .63X
reducer to get reasonable exposure times (at the expense of loss of
resolution). At f/6.3 to the best of my knowledge you can't use
all four items. (2) Everything put together becomes a somewhat
cumbersome amount of weight hanging off of the back of the OTA.
Flexure may become a large problem.

Gene Horr

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