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Käsemann Circular Polarizers - The Greatest Quality Polarizer Available
The images about the left was taken without the 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 about 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 these TTL exposure meter sufficient reason for autofocus lenses. Circular polarization has exactly the same pictorial effect as linear polarization, but permits 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, employing a special cementing technique that resists delamination in humid climates. The resulting sandwich is then precision-polished again to attain highly accurate plano-parallel surfaces. Discriminating photographers regard the B+W Käsemann Polarizer as the most effective polarizer for the market. They are well fitted to applications that require the highest 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 how the filter is positioned in relation on the sun. Exposure compensation is all about two f-stops.
Why Use a Circular Polarizer?
Modern DSLR cameras have a very beam-splitting prism that sends part of the incoming light on the meter and part on the viewfinder. The effect is always that the sunshine entering the meter is partially polarized by the beam-splitter. A linear polarizer placed about the lens of such a system will act like a second polarizer and block light for the meter with a degree dependent on the angle between your prism as well as the polarizer about the lens. The end result is incorrect exposure/aperture values in the meter. This is exactly why you may need a circular polarizer with such cameras. The circular polarizer circumvents this issue by adding of your 1/4-wave retarder, or delay foil. This ensures that the linearly polarized light is changed into a rotation that appears unpolarized towards 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 elements of high-quality lenses as well as the plano surfaces of filters require the perfect shape and smoothness to attain the best optical quality. Dirt, greasy fingerprints, water marks and scratches decrease the image contrast as well as the sharpness, which may lead to 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 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 the location where the eye is most understanding of light, while its effect is greatly 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 practiced having a multilayer coating which requires a better effort and precision because unevenness and irregularities of the individual layers build through to one another and amplify one another. Schneider therefore runs on the plasma-assisted evaporation coating process where inert gas ions accelerated within an electrical field compact the material deposited around the lens surface inside vacuum chamber.
For photographers, the primary good thing about MRC coating, is it's capability to combat flare and ghosting. An added benefit is that their filters remain without any dirt longer, to ensure they certainly not need to become cleaned so often. When cleansing the filter does become necessary, it is really a lot easier to wipe from the dirt using a blower brush, due to MRC's capability to repel dirt and moisture. And also this reduces the likelihood of micro-scratches which can 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 features a front accessory thread and it is manufactured from brass. Compared on the earlier standard mount, the F-Pro mount, introduced in 2001, is now thinner. Now it can provide 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 in the front, but props up filter glass in position from your back. When removing a filter or lens hood that has been screwed on too tight towards the filter, the retaining ring is not at risk of loosening.
Circular polarizing filters are created for all cameras with beam splitters inside the light paths with their TTL exposure meter along 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 in the Käsemann-type filters are neutral in color, they use 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 accomplish 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 all polarizing filters. They are well suited for 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
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