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Old 09-03-2012, 09:15 AM
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gregbradley
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This is an interesting thread. Thanks Martin for the explanation. I have only used Nikon and Canon 50mm F1.8 and they seemed much the same as each other. I haven't used the faster 50mm lenses.

Martin I only suggested the spacing as a possible issue. If you can come to focus maybe then that is not an issue. But as you know many optics are designed with a critical spacing but I suppose that is reducers and flatteners. But for lenses if you can get it to focus perhaps that means its OK. New territory there for me. But if you are experiencing massive aberrations which you are it is certainly worth checking out as perhaps the aberrations diminish with correct spacing. You can of course still focus a scope with a reducer set at the wrong spacing but you will see aberrations.

Greg.
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