B+W 52mm Kaesemann Circular Polarizer with Multi-Resistant Coating

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Käsemann Circular Polarizers - the Highest Quality Polarizer Available


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.

The images on 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 generated for all cameras with beam splitters inside the light paths of the TTL exposure meter with autofocus lenses. Circular polarization has a similar pictorial effect as linear polarization, but allows for 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, 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 around the market. They are very well suited to applications that require the greatest possible imaging quality, especially with high-speed telephoto lenses and apochromatic lenses.

B+W Polarizers increase color saturation and reduce reflections. The filter factor varies in accordance with the way the filter is positioned in relation to the sun. Exposure compensation is approximately two f-stops.

Why Use a Circular Polarizer?

Modern DSLR cameras have a very beam-splitting prism that sends part from the incoming light for the meter and part on the viewfinder. The effect is that the sunshine entering the meter is partially polarized by the beam-splitter. A linear polarizer placed around the lens of such a system will act as being a second polarizer and block light for the meter by strategy for a degree dependent for the angle involving the prism and also the polarizer around 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 issue with the help of of your 1/4-wave retarder, or delay foil. This ensures the linearly polarized light is changed right into a rotation that appears unpolarized to the meter, leading to proper exposure/aperture readings.

MRC - a Special 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 aspects 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 lessen the image contrast and the sharpness, which may bring about blooming at light sources and come with 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. What this means is the reason 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 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 place that the eye is most sensitive to light, while its effect is cut down tremendously toward the blue-violet and purple-red end regions in 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 with a multilayer coating which takes a greater effort and precision because unevenness and irregularities of the individual layers build through to 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 within the vacuum chamber.

For photographers, the key good thing about MRC coating, is it's ability to combat flare and ghosting. An added benefit is their filters remain without any dirt longer, in order that they are doing not need to become cleaned so often. When cleansing the filter does become necessary, it can be a lot much easier to wipe over dirt using a blower brush, due to MRC's power to repel dirt and moisture. This reduces the chance of micro-scratches which may occur during cleaning.


Side take a glance at F-Pro Rotating
Mount. Click for larger view.
F-Pro Brass Filter Mount

This filter utilizes 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 for 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 over a full frame body, without vignetting. An additional advantage in the F-Pro mount is its modified retaining ring, which can be no more threaded in from the front, but props up filter glass in place from your back. When removing a filter or lens hood which has been screwed on too tight to the filter, the retaining ring isn't in danger of loosening.
Circular polarizing filters are designed for all cameras with beam splitters in the light paths of their TTL exposure meter sufficient reason for autofocus lenses. Circular polarization has the same 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 possess a 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 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 get the very best of polarizing filters. They are well fitted to applications which need the highest possible imaging quality, particularly 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