- About this item.
- This filter uses our XS-Pro Digital which is especially suited for DSLRs with wide angle and zoom lenses. It has a front thread for additional accessories. All XS-Pro Digital s are made of brass and are matte black to prevent reflections..
- MRC nano has an improved outer (8th) layer over regular MRC. 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..
- Manufactured from Water-White Schott Glass.
Size:60 mm
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 plane-parallel
optical glass. The resulting sandwich is then precision-polished
again to achieve highly accurate plane-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.
From the Manufacturer
---------------------
Käsemann Circular Polarizers - The Highest Quality Polarizer
Available
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Comparison of image with and without filter. ( https://images-na.ssl-images-.com/images/G/01/electronics/filters/schneider/5_1_Large._.jpg ) 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. ( https://images-na.ssl-images-.com/images/G/01/electronics/filters/schneider/5_1_Large._.jpg )
Comparison of image with and without filter. ( https://images-na.ssl-images-.com/images/G/01/electronics/filters/schneider/5_2_Large._.jpg ) 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. ( https://images-na.ssl-images-.com/images/G/01/electronics/filters/schneider/5_2_Large._.jpg )
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.
Käsemann polarizing foils are neutral in color, have a higher
efficiency than conventional polarizing foils, and are cemented
between high-grade plano-parallel optical glass, using a special
cementing technique that resists delamination in humid climates.
The resulting sandwich is then precision-polished again to
achieve highly accurate plano-parallel surfaces. Discriminating
photographers regard the B+W Käsemann Polarizer as the very best
polarizer on the market. They are well suited for applications
that require the highest possible imaging quality, especially
with high-speed telephoto lenses and apochromatic lenses.
B+W Polarizers increase color saturation and reduce reflections.
The filter factor varies according to how the filter is
positioned in relation to the sun. Exposure compensation is about
two f-stops.
Why Use a Circular Polarizer?
-----------------------------
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. That's why you need a
circular polarizer with such cameras. The circular polarizer
circumvents this problem by adding 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.
B+W's Superior MRC Coating with Nano Technology
-----------------------------------------------
Illustration of lotus effect on water droplet caused by nano
coating.
Illustration of lotus effect on water
droplet caused by nano coating. 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.
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.
The nano coating results in lotus effect on water droplet. The
nano coating results in lotus effect on water droplet. 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.
Side view of XS-Pro Digital . 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.
XS-Pro Digital Filter
---------------------------
This filter uses our rotating XS-Pro Digital 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 s are made of brass and are
matte black to prevent reflections.
