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Käsemann Circular Polarizers - The Greatest Quality Polarizer Available
The images for the left was taken with no filter.
The image on the right was taken using a
B+W Circular Polarizer. Click for larger view.
The images for 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 designed for all cameras with beam splitters in the light paths of the TTL exposure meter along with autofocus lenses. Circular polarization has 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 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 accomplish highly accurate plano-parallel surfaces. Discriminating photographers regard the B+W Käsemann Polarizer as the most effective polarizer around the market. They are very well fitted to applications which need the highest possible imaging quality, particularly with high-speed telephoto lenses and apochromatic lenses.
B+W Polarizers increase color saturation and reduce 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 with the incoming light on the meter and part on the viewfinder. The effect is the light entering the meter is partially polarized from the beam-splitter. A linear polarizer placed about the lens of such a system will act being a second polarizer and block light for the meter with a degree dependent for the angle relating to the prism and also the polarizer around the lens. The effect is incorrect exposure/aperture values from your meter. This is exactly why you need a circular polarizer with your cameras. The circular polarizer circumvents this issue with the help of of the 1/4-wave retarder, or delay foil. This ensures the linearly polarized light is changed right into a rotation that appears unpolarized on the meter, causing proper exposure/aperture readings.
MRC - A Particular Scratch-Resistant, Water and Dirt Repelling Coating
The left half of this filter has a
traditional coating. The right half
has MRC coating.
The lens elements of high-quality lenses and also the plano surfaces of filters require a perfect shape and smoothness to attain the best optical quality. Dirt, greasy fingerprints, water marks and scratches lessen the image contrast as well as the sharpness, which may result in blooming at light sources and provide 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 means the reason is reflection-reducing effect, that is thus another transmission-increasing effect, i.e. one which suppresses scattered light and ghost images and transmits more light, includes 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 the place that the eye is most sensitive 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 performed using a multilayer coating which needs a better effort and precision because unevenness and irregularities with the individual layers build through to each other and amplify one another. Schneider therefore uses a plasma-assisted evaporation coating process through which inert gas ions accelerated in a electrical field compact the material deposited about the lens surface within the vacuum chamber.
For photographers, the primary benefit of MRC coating, is it's ability to combat flare and ghosting. An added benefit is that their filters remain without any dirt longer, to ensure that they certainly not have to get cleaned so often. When washing the filter does become necessary, it is a lot easier to wipe off of the dirt with a blower brush, as an effect of MRC's power to repel dirt and moisture. And also this decreases the likelihood of micro-scratches which can occur during cleaning.
Side look at Slim Line Rotating
Mount. Click for larger view.
Slim Line Filter Mount
This filter utilizes a rotating Slim-Line mount made from aluminum for wide angle lenses. They don't have a very front accessory thread to stop vignetting with lenses as wide as 17mm in 35mm format. Some report success with lenses as wide as 16mm. A slip on cap is supplied.
Because this can be a rotatable polarizing filter, it includes a height of 5mm.
Circular polarizing filters are made for all cameras with beam splitters in the light paths of their TTL exposure meter 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 with the Käsemann-type filters are neutral in color, they possess 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 achieve 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 most effective of polarizing filters. They are well fitted to applications that need the highest possible imaging quality, especially with high-speed telephoto lenses and apochromatic lenses.
This filter uses our Slim-Line mount made of brass for wide angle lenses. They do not have a front accessory thread to avoid vignetting with lenses as wide as 17mm in 35mm format. A slip on cap is supplied with Slim filters, sizes 49mm through 82mm.
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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