Quote:
Originally Posted by OuterObsession
Yeah I saw that one but this line made me worry I wouldn't get good results as the ed100 is f9 "Designed for use with refractors with focal lengths of 400mm to 660mm and focal ratios of f/5 to f/7.5"
But I've heard from some that it still provides some correction a little bit outside of the range.
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It sure does. Takes away the central hot spot too.