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B+W 77mm Kaesemann Circular Polarizer with Multi-Resistant Coating
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- 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.
- 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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|Sold By||Available from these sellers||Amazon.com||Amazon.com||Big pineapple||Amazon.com||Breakthrough Photography, LLC|
|Item Dimensions||3.12 x 3.12 x 0.36 in||0.75 x 3.75 x 3.75 in||0.75 x 3.75 x 3.75 in||3.7 x 3.7 x 0.6 in||3.6 x 4.3 x 0.7 in||4 x 4 x 0.75 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.
MRC - A Special Scratch-Resistant, Water and Dirt Repelling Coating
traditional coating. The right half
has MRC coating.
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.
to bead up and slide right off.
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.
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 of brass. Compared to the earlier standard mount, the F-Pro mount, introduced in 2001, has become thinner. Now it can be used with wide angle lenses, including most 24mm focal lengths on a full frame body, without vignetting. Another advantage of the F-Pro mount is its modified retaining ring, which is no longer threaded in from the front, but holds the filter glass in place from the back. When removing a filter or lens hood that has been screwed on too tight to the filter, the retaining ring is not at risk of loosening.
Top customer reviews
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This filter is a marvel of engineering. The build quality is simply top-notch (the filter is Made in Germany).
This Filter vs A Non-Käsemann Filter
I debated between this filter and the other B+W filter, the B+W 77mm Circular Polarizer MRC Filter. According to B+W (Schneider Optics), the Käsemann uses the same MRC (Multi-Resistant Coating) technology, but it's one-up on the non-Käsemann filter because it uses "high-end" polarizing foils. To quote Schneider Optics:
"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 plano-parallel optical glass."
Another advantage the Käsemann filter has over the non-Käsemann filter is that it is edge-sealed to protect the polarizing foil from humidity.
Since the Käsemann filter is only a tad more expensive (as of this writing), the choice between the Käsemann and the non-Käsemann filter was a no-brainer for me.
A common advice photographers give regarding filters is to pick a filter that fits the largest of your lenses so you can use the same filter for your smaller lenses as well (by using Step-Up Rings). Since step-up rings allow you to use this filter for your smaller lenses, this could be the only circular polarizer filter you need for *all* of your lenses with varying filter thread sizes (77mm, 72mm, 67mm, 62mm, 58mm, 55mm, 52mm, and 49mm).
If you have a high quality lens, you shouldn't scrimp on the filter because your pictures will be only as good as your lowest-quality lens component allow. This filter may be pricey, but it's well worth the money.
Some of my information came from Lenstip.com. One thing that impressed me was the lack of flare the B+W had. I might have even considered the slim version of this filter which was rated #1 overall, but I opted for a different approach which, so far, has saved me some money, and might reduce or eliminate problems with vignetting or homogeneity towards the outer edges of any filter...even though this filter was exceptional in both of these categories.
My initial lenses which I wanted to use with this filter are the 18mm-55mm Nikon DX VR and the 55mm-200mm DX VR. Neither of these lenses would be considered exceptional professional equipment, but I wanted to plan for the future where I might start using more expensive professional lenses and didn't want to have filters which would limit the performance of the lens.
I chose to purchase 52mm to 72mm filter adapters from Goja (great quality BTW) for the two lenses above and then get the best filters I could afford in the 72mm size, as opposed to the native 52mm size of the lens interface. I was new to this concept, but a few of the more professional photographers have said this concept is a good one (It is interesting that I have seen very little information on this approach).
I didn't want to start investing in 77mm or 82mm filters since, like most things, the "extreme" practical limits of any product usually sky-rocket the cost. My reasoning was the 72mm size was a sizable upgrade to the 52mm lens and adapting the 72mm filter to the 52mm lens would effectively utilize the most perfect inner section of the filter. Additionally, I reasoned, any vignetting would be eliminated unless it came from the 52mm-72mm adapter ring. And, then additionally, it would probably be no problem to stack two filters such as a UV-Haze and the CPL without concern for vignetting.
Please understand I am not a professional photographer. Most of the above just seems logical to my engineer brain although my Grandfather was a professional photographer and I spent many many hours developing film in a dark room and have taken 1000's of pictures throughout the years.
Bottom Line: After using this filter for several hours of overall use and over the past month or two, my impressions are as follows:
-build quality is gorgeous--it feels like quality, and if there are any issues with threading and un-threading the filter into the lens (as a small number of reviews have mentioned), I have not experienced that since once threaded into the adapter ring, it stays with it and never comes out. The adapter rings are inexpensive and seem to screw and un-screw with no issue...so I would rather take the chance of wearing out an adapter ring's threads than an expensive filter's threads.
-picture quality is gorgeous--obviously this can be subjective to any degree depending on the specific requirements or desires of the user. I can only say the effect of the polarizer is, in my opinion, very natural and obvious. There is no flare that I have seen in more than 100 pictures with my Nikon D90 using both the 18-55 and the 55-200 lenses. And possibly any benefit of having the 72mm filter on the 52mm lens might be imagined, but it seems to work perfectly and looks good too.
-operation--the filter polarity adjustment ring is VERY smooth...I can't imagine it would make a difference if it were somehow "better" or smoother.
I considered other brands, but some issues with quality control and other things swayed me away from them. The B+W is not cheap, but the level of confidence in the build quality and picture quality easily justify the extra cost.