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Käsemann Circular Polarizers - the Highest Quality Polarizer Available
The images on the left was taken without filter.
The image about the right was taken using a
B+W Circular Polarizer. Click for larger view.
The images for the left was taken without any filter.
The image about the right was taken using a
B+W Circular Polarizer. Click for larger view.
Circular polarizing filters are generated for all cameras with beam splitters inside the light paths of their TTL exposure meter sufficient reason for autofocus lenses. Circular polarization has the identical pictorial effect as linear polarization, but permits proper exposure metering and/or autofocus distance settings.
Käsemann polarizing foils are neutral in color, have a higher efficiency than conventional polarizing foils, and so 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 very best polarizer around the market. They are very well fitted to applications which need the greatest 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 a filter is positioned in relation towards the sun. Exposure compensation is approximately two f-stops.
Why Use a Circular Polarizer?
Modern DSLR cameras use a beam-splitting prism that sends part with the incoming light on the meter and part on the viewfinder. The effect is the fact that the sunshine entering the meter is partially polarized with the beam-splitter. A linear polarizer placed about the lens of this kind of system will act like a second polarizer and block light towards the meter with a degree dependent for the angle relating to the prism as well as the polarizer on the lens. The result is incorrect exposure/aperture values from the meter. This is exactly why you need a circular polarizer basic cameras. The circular polarizer circumvents this issue with the help of of the 1/4-wave retarder, or delay foil. This ensures how the linearly polarized light is changed into 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 due to nano coating.
The nano coating is an surface of protection that comes standard wonderful XS-Pro Digital MRC filters. The nanotechnology based characteristic (lotus effect) produces an improved beading effect with water, making the cleaning with this filter even simpler and faster than in the past before. MRC nano posseses an improved outer (8th) layer over regular MRC.
The lens aspects of high-quality lenses along with the plano surfaces of filters require the perfect shape and smoothness to achieve the best optical quality. Dirt, greasy fingerprints, water marks and scratches reduce the image contrast along with the sharpness, which may lead to 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 brings about lotus impact on water droplet.
The MRC coating is first and foremost a broadband anti-reflection coating. This implies what has reflection-reducing effect, which is thus additionally 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 features a high effect within the medium wavelength range around yellow and yellow-green in which the eye is most understanding of 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 are only able to be practiced with a multilayer coating which needs a greater effort and precision because unevenness and irregularities in the individual layers build high on one another and amplify one another. Schneider therefore uses a plasma-assisted evaporation coating process by which inert gas ions accelerated within an electrical field compact the information deposited on the lens surface inside vacuum chamber.
For photographers, the primary good thing about MRC coating, is it's capability to combat flare and ghosting. An added benefit is their filters remain free of dirt longer, so that they certainly not have access to to be cleaned so often. When washing the filter does become necessary, it can be a lot better to wipe over dirt using a blower brush, as an effect of MRC's capability to repel dirt and moisture. This decreases the probability of micro-scratches which could 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 includes a front thread for additional accessories such as lens caps or hoods. All XS-Pro Digital mounts are made of brass and are matte black to prevent reflections.
Circular polarizing filters are generated for all cameras with beam splitters within the light paths of the TTL exposure meter and with autofocus lenses. Circular polarization has exactly 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 very 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're edge-sealed to guard the foil against humidity. Discriminating photographers regard the B+W Käsemann-Type Polarizing Filter to get the most effective coming from all polarizing filters. They are very well suited to applications that need the best possible imaging quality, especially 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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