In case someone is wondering about the difference in the XS and F designation;
http://www.schneideroptics.com/info/faq/bw.htm#qu26
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 lenses. This mount will avoid vignetting with most 17mm lenses on a full frame body. Some report success with lenses as wide as 16mm. 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. ALWAYS SHOOT A TEST TO CONFIRM WITH YOUR EQUIPMENT.
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.
Slim-Line: This mount is for wide angle lenses. They do not have a front accessory thread to avoid vignetting with lenses as wide as 17mm in 35mm format. Some report success with lenses as wide as 16mm. A slip on cap is supplied with Slim filters, sizes 49mm through 82mm. ALWAYS SHOOT A TEST TO CONFIRM WITH YOUR EQUIPMENT.
Extra-Wide: The diameter of the front portion of an EW "oversized" filter mount is much larger than the male thread that is screwed into the lens. As a result, the corresponding filter glass is also larger. When mounted to a wide angle lens with an angle of view of 110 degrees or even 120 degrees, vignetting is not an issue. Available in 62mm thru 110mm, EW filters should be used without a lens hood as vignetting may occur.
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.
HSB: Various lenses for Hasselblad cameras are equipped with bayonets for the attachment of filters and lens hoods. The advantage of a bayonet mount over threaded filters is quick attachment and removal. All HSB mounts are discontinued.
Series: Filter glass, in mounts without threads, are placed into special holders and are held in place with a retaining ring or lens hood. Available in series 7, 8, 9. Series 93 (9a) for Hasselblad is discontinued.
Drop-In: This mount is for use with the Schneider 28PC shift lens. 74mm Drop-In filters require the use of the 67EW drop-in filter holder with lens hood (65-060013).
Bayonet: Bay 1 is for Rollei and Yashica twin lens cameras. Bay 2, 3, and 6 are for Rollei twin lens cameras. Lens position prohibits placing a filter on the viewing and taking lenses at the same time. Rollei and Yashica Bayonet mounts 1,2 and 3, are discontinued.
Here is a quick guide to the thicknesses of the different mounts:
*All B+W Filter mounts are made of brass except the Slim-Line Circular Polarizer mounts which are made of aluminum for manufacturing reasons.
F-Pro (front threads)
Digital-Pro (front threads)
Slim-Line (no front threads)
XS-Pro Digital (front threads)
Extra-Wide (front threads)
Additionally, please refer to the following PDF for more info. For XS Pro Digital information
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