Rick,
I second John, unless you are going to stack filters there is no need for a thinner filter even on 24mm. On a 70-200mm a standard F-Pro filter is fine and I think you could even add one filter with out any issues.
Pete is correct that you do not need UV filters on DSLR's, but they do no harm either. I always go with B&W UV's, mostly out of habit from film days, or superstition. If you use Pete's advice, just beware that he accidentally gave you a link to a 72mm filter. For the UV F-Pro version click through Bryan's review here:
[url="http://www.the-digital-picture.com/Reviews/B-W-UV-Filter.aspx]http://www.the-digital-picture.com/Reviews/B-W-UV-Filter.aspx[/url]
The red buy at the top of the page will take you to B&H and by going though his review, it helps Bryan maintain this site. For what is worth, every lens I have starts with a B&W UV MRC version filter right out of the box. In addition, most<span style="background-color: #ff0000;"] <span style="color: #ff0000;"]L lenses require a filter to complete the waterproofing.
Chris




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