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Well Bill, that is a good point, and i can not re-engineer my 10" Carbon Strut Newt now. I built it to illuminate a particular spot size, so i gain nothing putting a full-frame on there. As you mentioned, it would mean a larger secondary and the image quality that results. Of my five scopes, only my two APOs could produce the necessary spot size for a full-frame, and that is with their 3" reducer corrector attached. Its not just the cost of the full-frame camera, but the flow on replacement costs in term of your other equipment.
Suavi an f3 newt scares the heck out of me, offset galore, i would not want to wrestle with it, and for imaging galaxies with a 10" newt i believe f5, as mine is, is the logical choice (@1250mm fl). I look at the various fast newt astrographs, with their mid tube corrected focusers and wonder why Hyperstar Edges are not a better choice, at f2.
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