"It Starts with the Glass"
Highly efficient standard circular polarizing filter 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.
B+W Polarizers increase color saturation and reduce reflections. The
neutral gray color and plane parallel polarizer material guarantee optimal
image results. High-quality optical glass ensures excellent pictorial
quality. The filter factor varies according to how the filter is
positioned in relation to the sun. Filter factor is between 2.3 and
2.8.