Any filter is going to degrade the image you get from your lens. It's just a question of weighing up to pros and cons of fitting filters and which one you use/ how much degredation you can stomach. I've been using B&W or none at all. Some lenses are worse than others when fitted with protective filters. My Sigma 15-30mm is simply (more) terrible with anything fitted (probably due to the poor filter ring/hood arrangement), Nikkor 80-200mm is passable......
One thing to mention about protective filters.... They do protect against other things not just rain. A lovely lens in the shop, looked after, except for a ruddy great scratch across the front element from suspected mud/grit. However, it never fails to amaze the number of top-notch Canon L and Nikon AF-S expensive glass seen with the cheapest Chinese filters screwed to the front!...So, I can see both sides of the 'for and against' can come into play.
I guess the key factor is to decide the as and when to use lens protection, rather than to fit and forget.
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primarily using Nikon film and digi kit, and some micro 4/3rds gear for experimenting with old lenses
Last edited by Joe; 01-10-09 at 14:48.
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