after reading all I can at Hoya and B+W website, I will go with B+W simply because they explained the differences between their many choices. Much more easy to understand their whole lineup than Hoya.
Just choose the mount which is F-Pro, XS-Pro or Digital Pro. B+W filters with MRC coating is easier to clean as well
Digital Pro and F-Pro is the same thing but Digital Pro mount is chrome in color and F-Pro is black. Then you choose either MRC or none. MRC of course is better and the mount is made of brass. The non-MRC type are made of alloy.
The XS-Pro is just a slimmer mount. If you are using it with extreme wide angle lenses, then get the XS-Pro, if not save some money as F-Pro will do. F-Pro is now thinner and can be use with 24mm wide angle lenses. If you are using M lenses which needs 46mm you are out of luck as XS-Pro smallest size is 49mm
26. What are the differences between the various B+W filter mounts?
F-Pro: Compared to the earlier standard mount introduced in 2001, the F-Pro mount has become thinner. Now it can be used with wide angle lenses, including most 24mm focal lengths on a full frame body, without vignetting. Another advantage of the F-Pro mount is it's modified retaining ring, which is no longer threaded in from the front, but holds the filter glass in place from the back. When removing a filter or lens hood that has been screwed on too tight to the filter, the retaining ring is not at risk of loosening. Diopters are mounted in the older mount due to glass thickness.
XS-Pro Digital: This mount is especially suited for DSLRs with wide angle and zoom lenses. It has a front thread for additional accessories such as lens caps or hoods. All XS-Pro Digital mounts are made of brass and are matte black to prevent reflections. Only UV, Clear, and Käsemann Circular Polarizers are offered in this mount, with the latest MRC nano coating.
Multi-Resistant Coating (MRC) with Nano Technology
The nano coating is an outer layer of protection that comes standard with all XS-Pro Digital MRC filters. The nanotechnology based characteristic (lotus effect) produces a better beading effect with water making the cleaning of this filter even simpler and faster than ever before. MRC nano has an improved outer (8th) layer over regular MRC.
Digital-Pro: The term "Digital-Pro" refers to the use of a brushed chrome ring as opposed to the standard black ring. There is no optical difference when comparing similar glass types. Digital-Pro filters may be used with both film and digital cameras.
This post has been edited by idoblu: Aug 16 2011, 01:36 PM