Quote:
Originally Posted by avandonk
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Remember folks that collecting star images are limited by diffraction for a given aperture and collecting very dim extended objects by focal ratio.
Of course aperture is king and always wins.
When they make a 600mm F1.5 optic I will get one. By binning x2 my system passes for this given I collect enough subs.
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Well you can always DIY-it (in terms of light gathering) with four 600mm f/3 optics to get that (Well almost. It would be more like f/1.8 in light gathering terms, accounting for the secondary obstruction). It might cost a little more
Best
JA