le lien chez schneider optics pour tout savoir sur les filtres B+W. https://www.schneideroptics.com/Ecom...ay.aspx?CID=57

Le haut de gamme chez B+W pour les polarisants, c'est PRO et KSM HTC (comme Kasemann) .Les XS Pro se sont les nano plus fins pour les objectifs grand angle et éviter le vignetage.

Je n'ai que des polarisants XS pro nano et un ND1000 , car avec un peu de chance il peut se monter sur plusieurs objectifs (grand angle ou pas )avec le même diamètre

B+W XS-Pro Mount
New-generation B+W ND filters for slim XS-Pro Digital filters and 100 x 100 mm sheet filters

Schneider-Kreuznach’s new ND filters are made with excellent, finely cut and polished special glass. The ND filter effect has been improved thanks to a combination of three different coatings achieved using a specially developed thin-film technology. To prevent distracting reflections, the coating includes a multi-layer anti-reflective part with seven layers on each side of the filter. The outer layer is dirt and water-repellent. Light absorption is extremely even across the entire visible area, producing perfect, color-neutral images. This new coating technology also means that ND filters can now be produced for the slim B+W XS-Pro Digital filter line. These XS-Pro filters have an extremely slim brass mount, making them ideal for discerning users of mirrorless system and DSLR cameras. Despite its slim design, the mount is fully equipped with a front thread for further accessories such as a lens hood or snap-on lens cover. The XS-Pro filter line is available from Ø 30.5 mm and is supplemented with a Ø 95 mm version.


Et voila la différence entre F Pro et XS Pro :

Precision Engineered Mounts
 Not all mounts are created equal. B+W has invested decades in perfecting the ideal design, materials and craftsmanship to maintain the industry’s respect. Made of quality brass, each mount is machined, then a black coating is applied to eliminate reflections. Photographers may choose from the: Premium XS-Pro Digital thin mount, or the Professional F-Pro standard mount *(ND Vario mounts are aluminum for manufacturing reasons).

Premium XS-Pro Digital
  • Ideal for short focal length zooms or prime lenses that are prone to vignetting with standard filter mounts.
  • Made for B+W Clear Protection Filters, UV Haze Filters, Käsemann HTC Circular Polarizing Filters & ND Vario Filters
  • Thin design—ideal for wide-angle lenses down to 17mm with a full frame DSLR
  • Front thread for additional accessories, snap-in lens cap
  • Exclusive MRC nano coating for the highest demands


Professional F-Pro
  • Most B+W filter types and diameters* are available in the standard F-Pro mount
  • Useful for wide angle lenses (24mm and longer on full frame DSLR cameras)
  • Front thread for additional accessories, snap-in lens cap
  • Single-Coated or MRC
    * Close-up lenses stop at 77mm and the full range of solid NDs are offered through 82mm.
    ND.3 and ND.6 are offered in 86mm through 122mm.