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Käsemann Circular Polarizers - the Highest Quality Polarizer Available
The images around the left was taken without the filter.
The image about the right was taken using a
B+W Circular Polarizer. Click for larger view.
The images about the left was taken without the filter.
The image around the right was taken using a
B+W Circular Polarizer. Click for larger view.
Circular polarizing filters are created for all cameras with beam splitters inside light paths of the TTL exposure meter along with autofocus lenses. Circular polarization has exactly the same pictorial effect as linear polarization, but permits proper exposure metering and/or autofocus distance settings.
Käsemann polarizing foils are neutral in color, use a higher efficiency than conventional polarizing foils, and are cemented between high-grade plano-parallel optical glass, utilizing a special cementing technique that resists delamination in humid climates. The resulting sandwich is then precision-polished again to realize highly accurate plano-parallel surfaces. Discriminating photographers regard the B+W Käsemann Polarizer as the most effective polarizer on the market. They are well suited for applications which need the best possible imaging quality, particularly with high-speed telephoto lenses and apochromatic lenses.
B+W Polarizers increase color saturation minimizing reflections. The filter factor varies in accordance with how the filter is positioned in relation towards the sun. Exposure compensation is about two f-stops.
Why Use a Circular Polarizer?
Modern DSLR cameras use a beam-splitting prism that sends part in the incoming light on the meter and part on the viewfinder. The effect is the light entering the meter is partially polarized with the beam-splitter. A linear polarizer placed around the lens of this kind of system will act as a second polarizer and block light to the meter by strategy for a degree dependent about the angle between your prism along with the polarizer for the lens. The result is incorrect exposure/aperture values in the meter. This is exactly why you'll need a circular polarizer with such cameras. The circular polarizer circumvents this issue by adding of a 1/4-wave retarder, or delay foil. This ensures that this linearly polarized light is changed in a rotation that appears unpolarized to the meter, causing proper exposure/aperture readings.
B+W's Superior MRC Coating with Nano Technology
Illustration of lotus effect on water
droplet brought on by nano coating.
The nano coating is an outer layer of protection which comes standard with all of XS-Pro Digital MRC filters. The nanotechnology based characteristic (lotus effect) produces a better beading effect with water, making the cleaning with this filter even simpler and faster than ever before before. MRC nano comes with an improved outer (8th) layer over regular MRC.
The lens aspects of high-quality lenses and also the plano surfaces of filters require a perfect shape and smoothness to realize the best optical quality. Dirt, greasy fingerprints, water marks and scratches reduce the image contrast and also the sharpness, which may result in blooming at light sources and come with an effect just like 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 brings about lotus impact on water droplet.
The MRC coating is first and foremost a broadband anti-reflection coating. This implies that it is reflection-reducing effect, which can be thus also a transmission-increasing effect, i.e. one which suppresses scattered light and ghost images and transmits more light, features a broadband action over the full spectrum. In contrast, the (almost always blue) single-layer coating only features a high effect inside medium wavelength range around yellow and yellow-green where the eye is most responsive to light, while its effect is cut down tremendously 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 are only able to be practiced with a multilayer coating which takes a much higher effort and precision because unevenness and irregularities of the individual layers build up on each other and amplify one another. Schneider therefore uses a plasma-assisted evaporation coating process where inert gas ions accelerated in an electrical field compact the information deposited on the lens surface in the vacuum chamber.
For photographers, the primary good thing about MRC coating, is it's ability to combat flare and ghosting. An added benefit is that their filters remain free from dirt longer, in order that they certainly not have access to to get cleaned so often. When cleansing the filter does become necessary, it can be a lot better to wipe off of the dirt with a blower brush, because of MRC's power to repel dirt and moisture. This decreases the likelihood of micro-scratches which can occur during cleaning.
XS-Pro Digital Filter Mount
This filter uses our rotating XS-Pro Digital mount that is especially suited for DSLRs with wide angle and zoom lenses. It has a front thread for additional accessories for example lens caps or hoods. All XS-Pro Digital mounts are made of brass and therefore are matte black to stop reflections.
Circular polarizing filters are designed for all cameras with beam splitters within the light paths of their TTL exposure meter and with autofocus lenses. Circular polarization has a similar pictorial effect as linear polarization, but permits proper exposure metering and/or autofocus distance settings. The "high-end" polarizing foils with the Käsemann-type filters are neutral in color, they have a very higher efficiency than conventional polarizing foils and they also are cemented between high-grade plane-parallel optical glass. The resulting sandwich is then precision-polished again to realize highly accurate plane-parallel surfaces. Subsequently they may be 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 to applications which need the highest possible imaging quality, particularly with high-speed telephoto lenses and apochromatic lenses.
This filter uses our XS-Pro Digital mount which is especially suited for DSLRs with wide angle and zoom lenses. It has a front thread for additional accessories. All XS-Pro Digital mounts 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
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