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That is a good point. Its the strehl ratio at the eyepiece that should be quoted.
Another reason a good refractor can outperform its aperture compared to compound scopes.
However at a certain size compound scopes take the lead as a 10 inch APO is too big, heavy, long and expensive compared to say a 14 inch compound scope.
Where they meet is a point of debate but I estimate from my experience a good 7 inch APO will match or even surpass a 12.5 inch compound scope even an RC. The RC will get a bit more detail but not necessarily a more pleasing image and will take longer exposure to get there.
A 14.25 inch RC though I would say has a definite advantage over a 7 inch APO but is less versatile as reducers do not work on RC scopes with big chip cameras which nearly all new modern cameras are.
So with that in mind are you better off getting an ED120 or EON120 or the APO127 which I think are a similar proce tag compared to an 8 inch RC with unproven and most lilkely poor optics.
Are these RCs made in Taiwan? If they are I would have more confidence in them. Astrotech make really nice refractors.
Greg.
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