Rectangular Filter Reviews

[Kayaker72]

....these are not reviews of rectangular filters, but perhaps the best review of UV filters I have seen to date....

http://www.lenstip.com/113.1-article...ters_test.html

The top three ranked UV filters were all variations of the Hoya HMC or Pro MC. The B+W MRC does well, but comes in fourth. This is almost entirely because the Hoya HMC/Pro MC does a better job at blocking UV radiation, and these are UV filters. However, the B+W actually does a little better (~1%) on letting light in the visible spectrum pass through the filter. Given that I use the filters as physical protection, I personally am probably more concerned about the transmittance of visible light. But it seems that Hoya HMC or B+W MRC are all very good filters and very good options. Interestingly, this really shows the variation within brands.

(borrowed from a post on CR)