Quote:
Originally Posted by CalvinKlein
Hmmmmm - 5mm off centre vs 70% coma free is a big difference.
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Not really. 5mm off center means you'll cover a 10mm diagonal chip. Depends on your sensor size . If it's a planetary camera your sensor will be tiny and you might not have any coma at all. Just got to figure out what your imaging circle is on an uncorrected 10" F/4 newt (I'd expect 15mm at least) then work your way back to your sensor size and work out the surface you can work with.