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Käsemann Circular Polarizers - The Greatest Quality Polarizer Available
The images around the left was taken with no filter.
The image around the right was taken using a
B+W Circular Polarizer. Click for larger view.
The images on the left was taken without the filter.
The image for the right was taken using a
B+W Circular Polarizer. Click for larger view.
Circular polarizing filters are made for all cameras with beam splitters within the light paths of their TTL exposure meter with autofocus lenses. Circular polarization has exactly the same pictorial effect as linear polarization, but enables proper exposure metering and/or autofocus distance settings.
Käsemann polarizing foils are neutral in color, possess 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 realize highly accurate plano-parallel surfaces. Discriminating photographers regard the B+W Käsemann Polarizer as the top polarizer about the market. They are very suited to applications that require the highest possible imaging quality, especially with high-speed telephoto lenses and apochromatic lenses.
B+W Polarizers increase color saturation and lower reflections. The filter factor varies according to the way the filter is positioned in relation for 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 of the incoming light on the meter and part towards the viewfinder. The effect is the light entering the meter is partially polarized by the beam-splitter. A linear polarizer placed around the lens of a real system will act being a second polarizer and block light on the meter by the degree dependent for the angle between the prism and also the polarizer about the lens. The end result is incorrect exposure/aperture values through the meter. This is exactly why you will need a circular polarizer basic cameras. The circular polarizer circumvents this problem with the addition of of an 1/4-wave retarder, or delay foil. This ensures that the linearly polarized light is changed right into a rotation that appears unpolarized to the meter, resulting in proper exposure/aperture readings.
MRC - A Particular Scratch-Resistant, Water and Dirt Repelling Coating
The left 50 % of this filter has a
traditional coating. The right half
has MRC coating.
The lens components of high-quality lenses and the plano surfaces of filters require an ideal shape and smoothness to attain the best optical quality. Dirt, greasy fingerprints, water marks and scratches decrease the image contrast and the sharpness, which could result in blooming at light sources and have an effect much like 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 implies what has 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 includes a high effect in the medium wavelength range around yellow and yellow-green the location where the eye is most understanding of light, while its effect is greatly reduced toward the blue-violet and purple-red end regions from 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 is only able to be practiced with a multilayer coating which takes a greater effort and precision because unevenness and irregularities of the individual layers build up on the other person and amplify one another. Schneider therefore runs on the plasma-assisted evaporation coating process through which inert gas ions accelerated within an electrical field compact the material deposited about the lens surface inside vacuum chamber.
For photographers, the key benefit of MRC coating, is it's ability to combat flare and ghosting. An added benefit is the fact that their filters remain free of dirt longer, to ensure that they are doing not have access to to get cleaned so often. When washing the filter does become necessary, it is really a lot much easier to wipe off the dirt with a blower brush, due to MRC's power to repel dirt and moisture. This decreases the likelihood of micro-scratches which could occur during cleaning.
Side view of F-Pro Rotating
Mount. Click for larger view.
F-Pro Brass Filter Mount
This filter uses a rotating B+W F-Pro filter mount for added creative options. The mount has a front accessory thread and is made from brass. Compared towards the earlier standard mount, the F-Pro mount, introduced in 2001, is now thinner. Now it may be utilized with wide angle lenses, including most 24mm focal lengths over a full frame body, without vignetting. An additional advantage with the F-Pro mount is its modified retaining ring, that is don't threaded in in the front, but props up filter glass set up in the back. When removing a filter or lens hood which includes been screwed on too tight on the filter, the retaining ring just isn't in danger of loosening.
Circular polarizing filters are made for all cameras with beam splitters inside the light paths of their TTL exposure meter and with autofocus lenses. Circular polarization has a similar 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 plus they are cemented between high-grade plane-parallel optical glass. The resulting sandwich is then precision-polished again to accomplish 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 become the most effective of polarizing filters. They are very fitted to applications that need the greatest possible imaging quality, especially with high-speed telephoto lenses and apochromatic lenses.
This filter uses our standard B+W F-Pro filter mount, which has a front accessory thread and is made of brass.
MRC by B+W is not only an extraordinarily effective multiple layer coating, it is also harder than glass.
So that it protects filters from scratches, and it is also water and dirt repellent, thus facilitating filter maintenance.
It protects filters from scratches, and it is also water and dirt repellent, thus facilitating filter maintenance.
Manufactured from Water-White Schott Glass
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