Circular polarizing filters are made for all cameras with beam
splitters in the light paths of their TTL exposure meter and with
autofocus lenses. Circular polarization has the same pictorial
effect as linear polarization, but allows for proper exposure
metering and/or autofocus distance settings.
The “high-end” polarizing foils of the Käsemann-type filters are
neutral in color, they have a higher efficiency than conventional
polarizing foils and they are cemented between high-grade
plano-parallel optical glass. The resulting sandwich is then
precision-polished again to achieve highly accurate plano-parallel
surfaces. Subsequently they are edge-sealed to protect the foil
against humidity. Discriminating photographers regard the B+W
Käsemann-Type Polarizing Filter to be the very best of all
polarizing filters. They are well suited for applications that
require the highest possible imaging quality, especially with
high-speed telephoto lenses and apochromatic lenses.
This filter uses our rotating XS-Pro Digital mount which is
especially suited for DSLRs with wide angle and zoom lenses. 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.
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
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