I am heading down to Bintel this afternoon and am still tossing up what to buy. i have been sold not to get a 10" (that saves me $300) but what you said about the F8 6" has thrown me a little. i am using a cropped DSLR to image so i believe i would need a faster scope than f8. i was thinking of an f4 8" (being aware that i will have to coma correct), but do you think that the f5 would be better? a bit more magnification and a little less coma.
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