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it could be alot of factors- even reflections off the cornea- thats also extra glass being put into an F5 system- al nagler even admitted the extra reflections and light scatter when comparing barlowed naglers to a simple quality abbe ortho, i once had a C5 that drove me crazy with reflections- turned out to be a collimation issue- jupiters tuff to judge, what does a bright star test show on reflections?
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