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Käsemann Circular Polarizers - the Highest Quality Polarizer Available
The images around the left was taken without the filter.
The image for 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 for 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 the light paths with their TTL exposure meter with autofocus lenses. Circular polarization has the identical pictorial effect as linear polarization, but allows for proper exposure metering and/or autofocus distance settings.
Käsemann polarizing foils are neutral in color, possess a higher efficiency than conventional polarizing foils, and therefore are cemented between high-grade plano-parallel optical glass, employing a special cementing technique that resists delamination in humid climates. The resulting sandwich is then precision-polished again to accomplish highly accurate plano-parallel surfaces. Discriminating photographers regard the B+W Käsemann Polarizer as the most effective polarizer about the market. They are very 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 minimizing reflections. The filter factor varies as outlined by how the filter is positioned in relation on the sun. Exposure compensation is all about two f-stops.
Why Use a Circular Polarizer?
Modern DSLR cameras have a very beam-splitting prism that sends part in the incoming light to the meter and part for the viewfinder. The effect is the sunshine entering the meter is partially polarized with the beam-splitter. A linear polarizer placed on the lens of a real system will act being a second polarizer and block light to the meter by way of a degree dependent about the angle between the prism and also the polarizer about the lens. The effect is incorrect exposure/aperture values through the meter. That's why you'll need a circular polarizer with your cameras. The circular polarizer circumvents this issue with the help of of a 1/4-wave retarder, or delay foil. This ensures that this linearly polarized light is changed in to a rotation that appears unpolarized on the meter, leading to proper exposure/aperture readings.
MRC - A Unique Scratch-Resistant, Water and Dirt Repelling Coating
The left half this filter has a
traditional coating. The right half
has MRC coating.
The lens components of high-quality lenses and also the plano surfaces of filters require a perfect shape and smoothness to achieve the best optical quality. Dirt, greasy fingerprints, water marks and scratches decrease the image contrast and the sharpness, which can result in blooming at light sources and provide an effect comparable 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 implies the reason is reflection-reducing effect, which can be thus another transmission-increasing effect, i.e. one which suppresses scattered light and ghost images and transmits more light, includes a broadband action in the full spectrum. In contrast, the (almost always blue) single-layer coating only includes a high effect within the medium wavelength range around yellow and yellow-green the location where the eye is most responsive to light, while its effect is 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 is only able to be achieved having a multilayer coating which requires a better effort and precision because unevenness and irregularities of the individual layers build through to the other person and amplify one another. Schneider therefore utilizes a plasma-assisted evaporation coating process by which inert gas ions accelerated within an electrical field compact the information deposited for the lens surface inside the vacuum chamber.
For photographers, the main benefit of MRC coating, is it's ability to combat flare and ghosting. An added benefit is the very fact that their filters remain free from dirt longer, to ensure that they do not have to get cleaned so often. When washing the filter does become necessary, it can be a lot easier to wipe off of the dirt with a blower brush, as a result of MRC's capability to repel dirt and moisture. And also this decreases the chance 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 runs on the rotating B+W F-Pro filter mount for added creative options. The mount features a front accessory thread and it is made of brass. Compared to the earlier standard mount, the F-Pro mount, introduced in 2001, has become thinner. Now it might be utilized with wide angle lenses, including most 24mm focal lengths on a full frame body, without vignetting. Another advantage in the F-Pro mount is its modified retaining ring, which is don't threaded in from your 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 on the filter, the retaining ring is not at an elevated risk of loosening.
Circular polarizing filters are designed for all cameras with beam splitters inside light paths of the TTL exposure meter along with autofocus lenses. Circular polarization has the identical pictorial effect as linear polarization, but permits proper exposure metering and/or autofocus distance settings. The "high-end" polarizing foils in the Käsemann-type filters are neutral in color, they have a higher efficiency than conventional polarizing foils and so 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're edge-sealed to protect the foil against humidity. Discriminating photographers regard the B+W Käsemann-Type Polarizing Filter to be the most effective of polarizing filters. They are very suited for applications that require the highest 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.
Manufactured from Water-White Schott Glass
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