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.
Linear and circular polarizers both consist of a linear polarizer
foil but differ in their construction in the following way. Modern
SLR cameras have have a beam-splitting prism that sends part of the
incoming light to the meter and part to the viewfinder. The effect
is that the light entering the meter is partially polarized by the
beam-splitter. A linear polarized placed on the lens of such a
system will act as a second polarizer and block light to the meter
by a degree dependent on the angle between the prism and the
polarizer on the lens. The result is incorrect exposure/aperture
values from the meter. The circular polarizer circumvents this
problem through the addition of a 1/4-wave retarder, or delay,
foil. This ensures that the linearly polarized light is changed
into a rotation that appears unpolarized to the meter, resulting in
proper exposure/aperture readings.
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