B+W 58ES INFRARED (092) 1057391 Manuel D’Utilisation

6

The important role played by the filter mount and its mechanically complex  
task are often underestimated. Although mounts are supposed to fix the 
high-quality filter 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 filter glass is 
screwed into a high-precision retaining ring, applying a pre-specified 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 flat Slim mount for extremely wide angles. This eliminates vignetting. 
For even more extreme focal lengths there is the Oversized mount on which 
the filter glass protrudes far beyond the thread of the retaining ring (more 
under “Filter mounts”). It is the high-grade mounts that finally make a B+W 
filter a true piece of high tech that you can rely on for many years to come. 

Black hard chrome plating, with
reflection-reducing finish 

CNC machines turn brass rods into 
precision rings