B+W 72mm Kaesemann Circular Polarizer with Multi-Resistant Coating

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Käsemann Circular Polarizers - The Best Quality Polarizer Available


The images for the left was taken with no 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 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 inside the light paths with their 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, use 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 very best polarizer for the market. They are well suited for 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 as outlined by how a filter is positioned in relation towards the sun. Exposure compensation is about two f-stops.

Why Use a Circular Polarizer?

Modern DSLR cameras have a beam-splitting prism that sends part from the incoming light on the meter and part on the viewfinder. The effect is the lighting entering the meter is partially polarized through the beam-splitter. A linear polarizer placed on the lens of a real system will act like a second polarizer and block light on the meter by a degree dependent around the angle between the prism and also the polarizer around the lens. The effect is incorrect exposure/aperture values in the meter. That's why you will need a circular polarizer by using these cameras. The circular polarizer circumvents this issue with the addition of of a 1/4-wave retarder, or delay foil. This ensures that the linearly polarized light is changed into a rotation that appears unpolarized to the meter, leading to 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 the perfect shape and smoothness to achieve the best optical quality. Dirt, greasy fingerprints, water marks and scratches lessen the image contrast and also the sharpness, which could 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. This means 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, has a broadband action on 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 the place that the eye is most sensitive to light, while its effect is reduced toward the blue-violet and purple-red end regions with 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 using a multilayer coating which takes a much higher effort and precision because unevenness and irregularities with the individual layers build high on each other and amplify one another. Schneider therefore utilizes a plasma-assisted evaporation coating process where inert gas ions accelerated in an electrical field compact the material deposited around the lens surface inside the vacuum chamber.

For photographers, the key advantage of MRC coating, is it's power to combat flare and ghosting. An added benefit is that their filters remain clear of dirt longer, to ensure they actually do not have access to to become cleaned so often. When cleansing the filter does become necessary, it is often a lot simpler to wipe off the dirt using a blower brush, because of MRC's power to repel dirt and moisture. This decreases the chance of micro-scratches which can occur during cleaning.


Side take a peek at 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 includes a front accessory thread and is also made of brass. Compared on the earlier standard mount, the F-Pro mount, introduced in 2001, has become thinner. Now it can be utilized with wide angle lenses, including most 24mm focal lengths on the full frame body, without vignetting. An additional advantage with the F-Pro mount is its modified retaining ring, that is no more threaded in through the front, but props up filter glass set up from the back. When removing a filter or lens hood which has been screwed on too tight for the filter, the retaining ring is not at an increased risk of loosening.
Circular polarizing filters are designed for all cameras with beam splitters inside light paths with their TTL exposure meter sufficient reason for 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 in 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 attain highly accurate plane-parallel surfaces. Subsequently they may be edge-sealed to safeguard the foil against humidity. Discriminating photographers regard the B+W Käsemann-Type Polarizing Filter to get the top of polarizing filters. They are very suited to applications which need the best 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