Good article, 'chelle. [Though I must admit to a certain amount of, "My God! How did it get THAT dirty?" And applying a little spit and polish to the cheap UV filter is better than no shooting at all.] Generally I'll buy Skylight filters rather than UV, as I like the slight warming. And, as the article points out, there is a real reason for using such heavy UV/haze filtering in the mountains. But, the contrast degradation and flare mentioned in the article is real. Silly to pay big bucks for a lens and then cover it with a piece of glass! I do now want to rush out and google these "hot mirror" filters. And the MRC coating, as I shoot in the rain a lot!