Protective filter… or not? I say beware of filter quality.

Started Apr 15, 2014 | Discussions thread
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Minolta Filter Experience.
In reply to JohnFrim, Apr 16, 2014

Some time back, I bought a Minolta 200mm f/2.8 G lens which came with its own specially made filter, with creamy white edge to exactly match the lens.

I took shots and was getting weird results.

Puzzled, I eventually took the lens off and cleaned the inside of the lens - which had quite a film on it. There wasn't any film on the outside. The lens then worked fine.
I've since cleaned a number of filters on Minolta and other old lenses, and a few seemed to have a fine film inside rather than outside - though none as bad as with that 200mm lens.

Is it the lens or is it the filter? I suspect something in the lens.

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