Quote:
Originally Posted by ghsmith45
I hope their optics are better than their spelling and grammar!
Scopes look good. I'd go for the 600mm f3.8--fast + good image scale at 2280mm focal length.
Geoff
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Yes it sounds good but I wonder if there is a reduced rate of gain of aperture at F3.8. Longer F ratios and larger aperture for sure gives a gain but I am not so sure that is the case for an F3.8. I can't point to any definite evidence beyond some 20 inch Newt images I have seen that were so so. Perhaps the Newt type of scope has sweet spots in aperture for average seeing, flex problems and length/size/weight. Newts get quite long. I wonder how that truss system holds up when they get that long, big and heavy.
Greg.