The B + W 67mm XS-Pro Ultraviolet (UV) MRC Nano Filter is a wise initial investment. It helps protect your valuable investment from dust, moisture and scratches, which can lead to costly repairs. B + W UV filters are excellent general purpose filters since they will not only protect your front element from airborne contaminants as well as fingerprints but also help you get better images at high altitude and while on the water. Using this filter will diminish the bluish cast caused by the various atmospheric factors, yet, it will not have an effect on the color balance of your shot. No increase in exposure is required.
A UV filter is the best available protection for the front element of your lens. A lens that accidentally gets dropped on its front element while hiking can potentially be saved by purchasing this item. Some people refer to them as "cheap insurance". Aside from that more-than-significant benefit, UV filters cut through some of the haze in the atmosphere rendering your photos clearer, sharper and more contrasty. For those who enjoy outdoor photography, especially distant vistas, a UV filter can produce a more distinct image by removing much of the blue tint normally associated with atmospheric haze.
B + W's MRC Nano coating takes filter production to a new level. It features improved cleaning capabilities. Water droplets will bead up better and be easier to remove from the filter. This filter is also scratch-resistant. Single coating is applied to one layer on each glass surface. This improves light transmission from about 92% (uncoated glass) to about 98%. It also has certain anti-reflective properties that help prevent against ghosting and internal flaring.
The filter ring is made from brass yielding a stronger product. Brass filter rings are also less prone to jamming. In addition, the seal between the glass and filter ring is exceptionally strong giving the filter added strength and durability. The excellent Schott Glass used in the manufacturing of this filter is legendary and synonymous with the highest standards of filter production.
XS-Pro Extr a-Slim
Provides extra-slim mounting rings that eliminate problems associated with SLR wide-angle and telephoto imaging. 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.
MRC by B+W is not only an extraordinarily effective multiple layer coating, it is also harder than glass, so that it protects filters from scratches (for instance when cleaning the filters), and it is also water and dirt repellent, thus facilitating filter maintenance.