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Originally Posted by GrampianStars
the ED80 kills my 8" SCT on planets
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I also have an ED80 but no way can I resolve the same detail with that as I can in my 10 inch dob and I wouldnt expect to with 80mm of aperture.
It really sounds to me that there is something wrong with the sct.
Dave47tuc used to own a 10inch lx200 which gave good planetary views (sold to mojo I hope he is using it, its too nice a scope to be collecting dust).
Im not bagging refractors, I just dont believe that a 4 inch achromat will beat an 8 inch gs dob (properly set up and collimated) on planets. Theres two factors working against the achromat, aperture and colour.