B+W 52mm XS-Pro Kaesemann Circular Polarizer with Multi-Resistant Nano Coating
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- This filter uses our XS-Pro Digital mount which is especially suited for DSLRs with wide angle and zoom lenses. It has a front thread for additional accessories. All XS-Pro Digital mounts are made of brass and are matte black to prevent reflections.
- MRC nano has an improved outer (8th) layer over regular MRC. The nanotechnology based characteristic (lotus effect) produces a better beading effect with water making the cleaning of this filter even simpler and faster than ever before.
- Manufactured from Water-White Schott Glass
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|Package Height||0.63 x 2.6 x 2.6 inches|
|Shipping Weight||0.09 pounds|
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|Item Dimensions||2.16 x 2.16 x 0.28 in||0.75 x 2.62 x 2.62 in||0.75 x 2.62 x 2.62 in||2.14 x 2.14 x 0.36 in|
Circular polarizing filters are made for all cameras with beam splitters in the light paths of their TTL exposure meter and with autofocus lenses. Circular polarization has the same pictorial effect as linear polarization, but allows for proper exposure metering and/or autofocus distance settings. The "high-end" polarizing foils of the Käsemann-type filters are neutral in color, they have 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 achieve highly accurate plane-parallel surfaces. Subsequently they are edge-sealed to protect the foil against humidity. Discriminating photographers regard the B+W Käsemann-Type Polarizing Filter to be the very best of all polarizing filters. They are well suited for applications that require the highest possible imaging quality, especially with high-speed telephoto lenses and apochromatic lenses.
From the Manufacturer
Käsemann Circular Polarizers - The Highest Quality Polarizer Available
The image on the right was taken using a
B+W Circular Polarizer. Click for larger view.
The image on the right was taken using a
B+W Circular Polarizer. Click for larger view.
Circular polarizing filters are made for all cameras with beam splitters in the light paths of their TTL exposure meter and with autofocus lenses. Circular polarization has the same 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 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 achieve highly accurate plano-parallel surfaces. Discriminating photographers regard the B+W Käsemann Polarizer as the very best polarizer on the market. They are well suited for applications that require the highest 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 according to how the filter is positioned in relation to 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 of the incoming light to the meter and part to the viewfinder. The effect is that the light entering the meter is partially polarized by the beam-splitter. A linear polarizer placed on the lens of such a system will act as a second polarizer and block light to the meter by a degree dependent on the angle between the prism and the polarizer on the lens. The result is incorrect exposure/aperture values from the meter. That's why you need a circular polarizer with such cameras. The circular polarizer circumvents this problem by adding 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, resulting in proper exposure/aperture readings.
B+W's Superior MRC Coating with Nano Technology
Illustration of lotus effect on water
droplet caused by nano coating.
The nano coating is an outer layer of protection that comes standard with all XS-Pro Digital MRC filters. The nanotechnology based characteristic (lotus effect) produces a better beading effect with water, making the cleaning of this filter even simpler and faster than ever before. MRC nano has an improved outer (8th) layer over regular MRC.
The lens elements of high-quality lenses and the plano surfaces of filters require a perfect shape and smoothness to achieve the best optical quality. Dirt, greasy fingerprints, water marks and scratches reduce the image contrast and the sharpness, which can result in blooming at light sources and have 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.
The MRC coating is first and foremost a broadband anti-reflection coating. This means that its 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 over the full spectrum. In contrast, the (almost always blue) single-layer coating only has 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 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 can only be achieved with a multilayer coating which requires a much higher effort and precision because unevenness and irregularities of the individual layers build up on one another and amplify one another. Schneider therefore uses a plasma-assisted evaporation coating process in which inert gas ions accelerated in an electrical field compact the material deposited on the lens surface in the vacuum chamber.
For photographers, the main advantage of MRC coating, is it's ability to combat flare and ghosting. An added benefit is that their filters remain free of dirt longer, so that they do not have to be cleaned so often. When cleaning the filter does become necessary, it is a lot easier to wipe off the dirt with a blower brush, because of MRC's ability to repel dirt and moisture. This also reduces the risk of micro-scratches which can occur during cleaning.
XS-Pro Digital Filter Mount
This filter uses our rotating XS-Pro Digital mount which is especially suited for DSLRs with wide angle and zoom lenses. It has a front thread for additional accessories such as lens caps or hoods. All XS-Pro Digital mounts are made of brass and are matte black to prevent reflections.
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Here is a list summary of the pros and cons:
- Polarizing effect is great and filtering is even through out.
- Does not attract any fingerprints around 95% of the time.
- Easy to clean dust and liquids off.
- Biggest size you can find. It's easy to downsize a filter with step up rings, but upsizing is impossible.
- Front part spins easily.
- I have a Canon EOS 7D (crop sensor), but so far, no vignette.
- Front threads are a bit short so only 3/4 of my lens cap goes in. I don't find this to be an issue as my lens cap still grips tightly.
Still using this with my new 5D Mark III. Took it right up to Bridalveil Falls in Yosemite National Park to take some shots of the waterfall. A lot of water got on the filter. What surprised me was that with a few puffs of air from my Giottos Rocket Air Blaster, the water just dripped off with no markings on the filter at all! That is how good this nano coating is! Definitely worth the price!
Anti-reflective coating: Some form of anti-reflection or anti-glare coating is absolutely necessary for, at least, the top-most filter in an optical system; even with a lens shade attached. This coating reduces the propagation of reflected incident light into the lens which increases contrast and color saturation of the resulting image. If you look at a light source reflected off the front surface of a anti-reflective coated filter (or lens or LCD) you should see that light is cast in an orange or purple (or both) hue. If this is not the case, or if the color casting fades in and out, especially towards the center of the filter, it is time to replace that filter. This is a no-brainer and I wouldn't consider a filter without it.
Hydrophobic/Oleophobic coating: A coating that resists water and fingerprints and, more-importantly, makes cleaning the water and fingerprints off your filter much easier and less likely to damage the AR coating or scratch the glass. This is a feature I hope I don't often need, but when I do, I'll be extremely happy it's there.
Mount construction: The taller the mount, the more likely it is to vignette or at least cause edge-darkness. This filter mitigates that by making the filter as thin as possible; about half the thickness of bargain-basement filters, and by placing the glass back towards the male threads so the female threading acts more like a lens shade than obstruction. This is the only non-Slim-line filter that I can put on a 17mm lens on a full-frame camera that does not vignette.
Polarizing foil neutrality: AWB, RAW conversion and post-production can alter, shift, saturate, bombast color to such an extent, it can make the slight variance in color-neutrality from high-end to bargain-basement polarizers seem superfluous. But if your working methodology is to capture the best possible image before post-production, you do care. A stray tint, even a slight one, can make you blind to shots that could be great. It could emphasize, lighten or darken colors that where not intended to be prominent or hidden. This is the most neutral circular polarizers I have worked with. A quick test: stack two CPLs on top of each other and rotate one. Non-circular polarizers would alternate between opaque and dark, but circular polarizers will alternate between blue and yellow tint. The more the tint shift, the less neutral the film. Stacking two bargain-basement polarizers typically results in a hideous brown to electric blue, while stacking two of these (I got one slim-line and one normal) resulted in almost no color change.
Polarizing foil effectiveness: There is a significant visible-to-the-naked-eye difference between a bargain-basement CPL and this. When comparing with a B+W non-Kaesemann with a B+W Kaesemann, the comparison becomes more subtle; but still present. I put a polarizing gel on a 24x36 soft box and shot various plastic and metallic surfaces, doing my best to match the alignment of both filters (harder than it sounds). The darkest areas where the filter has effect are the easiest to spot the differences. With the non-Kaesemann, the darks where a shade less deep; a shade less contrasty. The colors where deeper too.
The B+W Kaesemann CPL has been a pleasant surprise and now my only wish is to have bought one sooner.