Datasheet
6
The important role played by the lter mount and its mechanically complex
task are often underestimated. Although mounts are supposed to x the
high-quality lter glass in position “for life”, they must not cause any sharp-
ness-reducing tension in the glass. B+W manufactures various mount
types, mainly out of stable brass, on CNC machines. The lter glass is
screwed into a high-precision retaining ring, applying a pre-specied torque.
Besides the excellent F-Pro standard mount which is suitable for telephoto
lenses up to the most common wide-angle focal lengths, B+W offers the
very at Slim mount for extremely wide angles. This eliminates vignetting.
For even more extreme focal lengths there is the Oversized mount on which
the lter glass protrudes far beyond the thread of the retaining ring (more
under “Filter mounts”). It is the high-grade mounts that nally make a B+W
lter a true piece of high tech that you can rely on for many years to come.
Black hard chrome plating, with
reection-reducing nish
CNC machines turn brass rods into
precision rings