B+W 49mm Kaesemann Circular Polarizer with Multi-Resistant Coating

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Käsemann Circular Polarizers - the Highest Quality Polarizer Available


The images around the left was taken without 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 with no filter.
The image for 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 within the light paths of their TTL exposure meter sufficient reason for autofocus lenses. Circular polarization has the identical pictorial effect as linear polarization, but permits 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, utilizing 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 for the market. They are well fitted to applications that need the highest possible imaging quality, particularly with high-speed telephoto lenses and apochromatic lenses.

B+W Polarizers increase color saturation and lower reflections. The filter factor varies according to how a filter is positioned in relation towards 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 in the incoming light towards the meter and part to the viewfinder. The effect is always that the sunshine entering the meter is partially polarized with the beam-splitter. A linear polarizer placed on the lens of this kind of system will act being a second polarizer and block light for the meter with a degree dependent on the angle between your prism along with the polarizer around the lens. The result is incorrect exposure/aperture values through the meter. That's why you may need a circular polarizer basic cameras. The circular polarizer circumvents this challenge with the help of of the 1/4-wave retarder, or delay foil. This ensures that this linearly polarized light is changed into a rotation that appears unpolarized on the meter, leading to proper exposure/aperture readings.

MRC - a Special Scratch-Resistant, Water and Dirt Repelling Coating
The left half this filter has a
traditional coating. The right half
has MRC coating.
The lens aspects of high-quality lenses as well as the plano surfaces of filters require a great shape and smoothness to achieve the best optical quality. Dirt, greasy fingerprints, water marks and scratches decrease the image contrast and also the sharpness, which could lead to blooming at light sources and come with an effect similar 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 that it is reflection-reducing effect, which is 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 in the medium wavelength range around yellow and yellow-green where 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 are only able to be performed using a multilayer coating which takes a much higher effort and precision because unevenness and irregularities of the individual layers build on the other person and amplify one another. Schneider therefore utilizes a plasma-assisted evaporation coating process by which inert gas ions accelerated in a electrical field compact the information deposited on the lens surface inside vacuum chamber.

For photographers, the main advantage of MRC coating, is it's capability to combat flare and ghosting. An added benefit is that their filters remain clear of dirt longer, in order that they are doing not have to become cleaned so often. When washing the filter does become necessary, it is often a lot much easier to wipe off the dirt having a blower brush, because of MRC's capability to repel dirt and moisture. This also reduces the chance of micro-scratches which could occur during cleaning.


Side look at 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, has become thinner. Now it could supply with wide angle lenses, including most 24mm focal lengths on a full frame body, without vignetting. An additional from the F-Pro mount is its modified retaining ring, which is no more threaded in in the front, but supports the filter glass in position from your back. When removing a filter or lens hood that has been screwed on too tight on the filter, the retaining ring just isn't vulnerable of loosening.
Circular polarizing filters are generated for all cameras with beam splitters in the light paths with their TTL exposure meter with autofocus lenses. Circular polarization has a similar pictorial effect as linear polarization, but permits proper exposure metering and/or autofocus distance settings. The "high-end" polarizing foils with 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 realize highly accurate plane-parallel surfaces. Subsequently they're edge-sealed to safeguard the foil against humidity. Discriminating photographers regard the B+W Käsemann-Type Polarizing Filter to be the top coming from all polarizing filters. They are very well suited for applications that need the greatest 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