Originally Posted by
Drew Wiley
Alan - Don't worry about that. I already did plenty of testing with the 90/4.5 + CF + contrast filters too. Just go ahead and focus first, then add the filters. But REAR mounting filters on a lens is a no no unless otherwise specified. There are some modern lenses which are less than ideally corrected, especially at the widest apertures, and can exhibit a bit of focus shift between different colors of very deep contrast filters, even high quality glass ones mounted on the front. So when in doubt, carefully test. It's more likely to be a problem with MF lenses.
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