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Re: [ATM] Diagonal Size
Hi Scott,
>If you want an 8" unobstructed, just build a 10" standard
>Newtonian and it will perform as well or better than the 8".
I would say considerably better, if the Newt has less than 18% obstruction, and if it is made with the same care as the refractor. I once compared my old 8" f/8 Newt with the best 8" refractor made by TMB, in great seeing. Let me tell you, that is a fabulous refractor. Both scopes resolved equally on the moon and Mars and double stars. The refractor had a slightly more pleasing view, I think because he had better eyepieces and I had the spider (3-vane curved). However, the Newt was able to go higher magnification. The refractor owner wouldn't go over ~300x. I think maybe he had a chromatic problem...
So I think a well-made 8" scope is an 8" scope, whether Newt or refractor.
John
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