Quote Originally Posted by Cris


the silm version,,,



If you mean the XS-PRO mount, sort of. Most B+W filters are either F-Pro mount or SLIM mount - the slim mount is thinner because it lacks front threads, meaning you need to use the provided slip-on cap instead of the Canon (or other) cap that came with the lens, since those require threads. So, SLIM is fine for a filter that won't 'live' on your lens, but not ideal for a UV filter intended to remain on the lens full time. The XS-PRO mount is just about as thin as the SLIM mount, but it does have front threads (one fewer turn than the F-Pro), meaning the standard cap will work (or another filter can be stacked, if absolutely needed).