Product Description
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High Quality German Filters
From the Manufacturer
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Circular Polarizers - Increase Color Saturation, Reduce
Reflections
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The images on the left was taken without any filter.
The image on the right was taken using a
B+W Circular Polarizer. Click for larger view.
The images on the left was taken without any filter.
The image on the right was taken using a
B+W Circular Polarizer. Click for larger view.
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.
Exposure compensation is about two f-stops.
Linear and circular polarizers both consist of a linear polarizer
foil but differ in their construction in the following way.
Modern DSLR cameras 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 polarizer 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.
MRC - A Special Scratch-Resistant, Water and Dirt Repelling
Coating
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The left half of this filter has a
traditional coating. The right half
has MRC coating.
The lens elements of high-quality lenses and the plano surfaces
of filters require a perfect shape and smoothness to achieve the
best optical quality. Dirt, greasy fingerprints, water marks and
scratches reduce the image contrast and the sharpness, which can
result in blooming at light sources and have an effect similar to
a soft-focus lens. A clean front lens element and clean filter
surfaces are therefore an absolute pre-requisite for demanding
photographers.
MRC coating causes water
to bead up and slide right off.
The MRC coating is first and foremost a broadband
anti-reflection coating. This means that its reflection-reducing
effect, which is thus also a transmission-increasing effect, i.e.
one which suppresses scattered light and ghost images and
transmits more light, has a broadband action over the full
spectrum. In contrast, the (almost always blue) single-layer
coating only has a high effect in the medium wavelength range
around yellow and yellow-green where the eye is most sensitive to
light, while its effect is greatly reduced toward the blue-violet
and purple-red end regions of the visible spectrum. With the MRC
coating, this blue, violet and red to deep-red light cannot
produce any contrast reducing scattered light, spotty reflections
or ghost images. A broadband effect can only be achieved with a
multilayer coating which requires a much higher effort and
precision because unevenness and irregularities of the individual
layers build up on one another and amplify one another. Schneider
therefore uses a plasma-assisted evaporation coating process in
which inert ions accelerated in an electrical field compact
the material deposited on the lens surface in the vacuum chamber.
For photographers, the main advantage of MRC coating, is it's
ability to combat flare and ghosting. An added benefit is that
their filters remain free of dirt longer, so that they do not
have to be cleaned so often. When cleaning the filter does become
necessary, it is a lot easier to wipe off the dirt with a blower
brush, because of MRC's ability to repel dirt and moisture. This
also reduces the risk of micro-scratches which can occur during
cleaning.
Side view of F-Pro Rotating
. Click for larger view.
F-Pro Brass Filter
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This filter uses a rotating B+W F-Pro filter for added
creative options. The has a front accessory thread and is
made of brass. Compared to the earlier standard , the F-Pro
, introduced in 2001, has become thinner. Now it can be used
with wide angle lenses, including most 24mm focal lengths on a
full frame body, without vignetting. Another advantage of the
F-Pro is its modified retaining ring, which is no longer
threaded in from the front, but holds the filter glass in place
from the back. When removing a filter or lens hood that has been
screwed on too tight to the filter, the retaining ring is not at
risk of loosening.
- Brass Ring for higher Quality Image.
- Highest possible polishiing technique.
- World's best optical glass.
- New thinner Pro . No vignetting.
