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Thank you Joe, Matt and Marc.
To answer some of Matt's items to consider:
Diffraction spikes are not a concern to me.
Coma is not a concern either. Heck, I don't bother with a coma corrector in my f/4.5 Newts. Plus as this Cassegrain will be pretty much just for high power, coma is even less problematic. Any photo applications with me will be confined to the Moon and planets with this scope.
I'm sure any mirror flop will be significantly less than the SCT's I've had to deal with...
Thanks for the focusing tip too!
Where I store my scopes it is a cool location to begin with - I try not to let my scopes get warm.
Alex.
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