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I only use protective UV or clear filters on the rare occassions that I shoot in a hostile environment with blowing sand, salt water spray, and similar challenges. When I do use one, it's a B+W MRC filter. I have a few in 77mm diameter, and singles in other sizes, which covers my needs.
Every year or two I do a comparison of UV filter vs. no filter in very bright conditions, and I've never seen the UV filter produce better images. In many conditions, a filter will add a touch of flare, that slightly reduces contrast, which is counter-productive for sharp images.
You'll find many previous posts on these issues. Try this for starters, http://www.fredmiranda.com/forum/topic/745528
Edited on Dec 28, 2011 at 06:01 PM · View previous versions