Wel I can honestly say that none of my filters have impaired any of the photographs I have taken and I've taken thousands, in fact in a lot of cases they have definately improved the picture. I must emphasise that I keep them scrupulously clean and avoid reflecting highlights from the side wherever possible. It could be that this is a problem that is more apparent on digital images, we know that lenses for digital cameras need to be better corrected and the internal surfaces need to have a better matt finish to reduce reflections to a minimum. I see that Hoya and Sigma are now producing filters specially coated for digital imaging lenses, if that's the case then they obviously think it makes a difference!
nirofo.
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