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Hi, have any of you come across with the new B+W XSP (or XS-Pro Digital) filter?
It is of slim design while having front threads for mounting additional accessories such as filters, screw on shades and lens covers (as claimed by B+W website).
http://www.schneideroptics.com/news/110308_XS-Pro.htm
Is it true that it can hold the factory canon lens cap?
To be honest I'm not sure...never had experience with that particular model. However, two reviewers at B&H seem to like them.
I have the B+W XS-Pro 82 UV (010) and 72 UV (010) on my TS-E 24 3.5 L II and 85 1.2 L II respectively. They are 3 mm in thickness (they look actually a tiny bit thinner than Hoya Digital Pro-1) and they can fit the original Canon lens cap.
After fitting on the Canon caps, you can notice an 1-mm gap between the filter and the cap. But since the cap button can still click into the filter's front thread, it's still secure (although not as secure as the B+W F-Pro filters... I'd say it's like 90-95% as secure).
Quality-wise, it's as nice as you can expect from B+W.
Highly recommended for WA glasses if you have concerns on mechanical vignetting.