Quote:
Originally Posted by Graeme Bluestar
My area of interest is double stars so at the end of the day as long as the central area of the FOV is clear and crisp, a 20" scope for under $10K is still a lot of bang for your buck.
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Graeme,
I use my 18" F4.5 quite a lot for double stars - especially for faint ones. I make use of a 7" off axis mask which really is useful, I would be interested to know if you intend to use a mask.