B+W 39mm Kaesemann Circular Polarizer Multi Coated Glass Filter (66045606)

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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 on the left was taken with no filter.
The image on 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 with their TTL exposure meter sufficient reason for autofocus lenses. Circular polarization has a similar pictorial effect as linear polarization, but enables proper exposure metering and/or autofocus distance settings.

Käsemann polarizing foils are neutral in color, have a very higher efficiency than conventional polarizing foils, and 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 realize highly accurate plano-parallel surfaces. Discriminating photographers regard the B+W Käsemann Polarizer as the most effective polarizer about the market. They are very 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 in accordance with what sort of filter is positioned in relation on the sun. Exposure compensation is approximately two f-stops.

Why Use a Circular Polarizer?

Modern DSLR cameras have a beam-splitting prism that sends part with the incoming light on the meter and part to the viewfinder. The effect is the actual fact that the sunshine entering the meter is partially polarized with the beam-splitter. A linear polarizer placed around the lens of such a system will act as a second polarizer and block light on the meter by strategy for a degree dependent around the angle relating to the prism and the polarizer around the lens. The actual result is incorrect exposure/aperture values from your meter. That is why you'll need a circular polarizer with such cameras. The circular polarizer circumvents this issue with the help of of the 1/4-wave retarder, or delay foil. This ensures that the linearly polarized light is changed in 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 1 / 2 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 realize the best optical quality. Dirt, greasy fingerprints, water marks and scratches lessen the image contrast and also the sharpness, which can bring about blooming at light sources and come with 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 what has 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 on 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 in which the eye is most responsive to light, while its effect is greatly reduced 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 can only be performed using a multilayer coating which needs a greater effort and precision because unevenness and irregularities from the individual layers build high on the other person and amplify one another. Schneider therefore utilizes a plasma-assisted evaporation coating process where inert gas ions accelerated in a electrical field compact the information deposited around the lens surface within the vacuum chamber.

For photographers, the principle benefit of MRC coating, is it's capability to combat flare and ghosting. An added benefit is their filters remain free of dirt longer, so that they do not have access to to be cleaned so often. When washing the filter does become necessary, it can be a lot much easier to wipe off of the dirt using a blower brush, as a result of MRC's power to repel dirt and moisture. This also decreases the risk 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 also made from brass. Compared for the earlier standard mount, the F-Pro mount, introduced in 2001, is now thinner. Now it might provide with wide angle lenses, including most 24mm focal lengths on the 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 your front, but holds the filter glass in position in the back. When removing a filter or lens hood which has been screwed on too tight on the filter, the retaining ring just 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 and with autofocus lenses. Circular polarization has a similar pictorial effect as linear polarization, but allows for proper exposure metering and/or autofocus distance settings. The "high-end" polarizing foils from the Käsemann-type filters are neutral in color, they use a higher efficiency than conventional polarizing foils plus 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 guard the foil against humidity. Discriminating photographers regard the B+W Käsemann-Type Polarizing Filter to be the most effective of all polarizing filters. They are very well suited for applications that need 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