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  • B+W 77mm Kaesemann Circular Polarizer with Multi-Resistant Coating
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B+W 77mm Kaesemann Circular Polarizer with Multi-Resistant Coating

by B+W
| 22 answered questions

List Price: $356.00
Price: $128.99 & FREE Shipping. Details
You Save: $227.01 (64%)
In Stock.
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77mm
  • 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
10 new from $127.95 5 used from $99.00

Frequently Bought Together

B+W 77mm Kaesemann Circular Polarizer with Multi-Resistant Coating + B+W 77mm Clear UV Haze with Multi-Resistant Coating (010M) + Canon EF 70-200mm f/2.8L IS II USM Telephoto Zoom Lens for Canon SLR Cameras
Price for all three: $2,391.49

Buy the selected items together

Special Offers and Product Promotions

Size: 77mm
  • Buy Used and Save: Buy a Used "B+W 77mm Kaesemann Circular Polarizer with Multi-R..." and save 72% off the $356.00 list price. Buy with confidence as the condition of this item and its timely delivery are guaranteed under the "Amazon A-to-z Guarantee". See all Used offers.

Technical Details

Size: 77mm
  • Brand Name: B+W
  • Model: 66-045620
  • Item Package Quantity: 1
  • Item Display Diameter: 77 mm

Product Details

Size: 77mm
  • Product Dimensions: 3.1 x 3.1 x 0.4 inches ; 2.1 ounces
  • Shipping Weight: 3.5 ounces (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B0000BZLAC
  • Item model number: 66-045620
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (272 customer reviews)
  • Amazon Best Sellers Rank:
  • Date first available at Amazon.com: October 2, 2001

Product Description

Size: 77mm

Product Description

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

Comparison of image with and without filter.
The images on the left was taken without any filter.
The image on the right was taken using a
B+W Circular Polarizer. Click for larger view.
Comparison of image with and without filter.
The images on the left was taken without any filter.
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

Filter with half MRC coating and half conventional coating.
The left half of this filter has a
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.

MRC coating causes water to bead up and slide right off.
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 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.

Side view of F-Pro Rotating Mount.
Side view of 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 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.

Customer Reviews

Buy this B&W Kaesemann Circular Polarizer with confidence.
Robert A. Carola
I highly recommend this product for any photographer, especially if you do landscape photography.
Jesse Merz
They are high quality and worth every penny paid for them compared to the cheaper filters.
Van

Most Helpful Customer Reviews

149 of 154 people found the following review helpful By MyBeesWax TOP 500 REVIEWERVINE VOICE on August 18, 2010
Size Name: 77mm Verified Purchase
I got the B+W 58mm Circular Polarizer MRC Filter a few months ago. I was so pleased with the results that when I got my Canon 17-55mm lens, I opted to go with a B+W again -- and B+W did not disappoint. This Käsemann filter works as claimed; it increases color saturation and reduces (and in some cases completely eliminates) reflection.

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.
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Size Name: 77mm
இ Fuzzy Wuzzy's Summary:
ѾѾѾѾѾ Highly recommended with warm fuzzies!

This is the fourth B+W Kaesemann Circular Polarizer that I own. These filters are expensive, but they are worth the extra cost, especially under adverse conditions outdoors where lots of dust, moisture, and temperature changes are prevalent. Unlike B+W's standard circular polarizers, which also have the Multi-Resistant Coating (MRC), these Kaesemann ("encased") filters have a better premium-grade polarizing foil and these are completely edge-sealed for maximum durability under extreme climatic conditions due to changes in temperature and humidity. Since circular polarizers are mainly useful during mid-day outdoor shooting, and because I do a lot of backcountry nature and landscape photography that often involves many hours of daily hiking, I always purchase these B+W Kaesemann filters because they are one of the very best for outdoor shooting in environments ranging from hot and humid rain forests to below-freezing climates while hiking above timberline on a snow-covered mountain.

For mid-day outdoor shooting, this filter will add a huge "WOW!" factor to your photos. In fact, a circular polarizer adds more obvious visual benefits than any other kind of lens filter that you may use. Colors really sparkle, especially on landscape shots where the reds, blues, and greens really pop compared to photographing outside in the mid-day sun without using a circular polarizer. Circular polarizers remove specular reflections caused by sunlight bouncing off of surfaces and they enhance the saturation of colors in your photos. So when colors are being desaturated by some degree of specular reflection, the colors will be enhanced.
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83 of 89 people found the following review helpful By The Flying Dutchman on August 2, 2007
Size Name: 77mm
Excellent filter!
I have had many filters in the course of almost 50 Years photography, including numerous Polarizer filters. This one however is astounding in results and Quality. I have (due to special circumstances) been lucky enough to be able to shoot and compare shots with this one, and other shots taken immediately after that with a selection of other brands!
This one however was a clear winner, NO doubt about it!
It is a little more in price, but in my estimation it is worth it.
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88 of 96 people found the following review helpful By G. Wagstaff on February 15, 2007
Size Name: 77mm
Hands down the best polarizer I've ever used. Very solid construction and outstanding glass.

Why spend thousands, or even hundreds for that matter, on a lens and then stick a sub-standard piece of glass on the front. That makes absolutely no sense to me at all. Your image is only going to be as good as your weakest link. And a shoddy filter is a weak link indeed.

You really do get what you pay for and this is no exception. It may seem a bit pricey but it could very well be the last one you'll ever have to buy...just make sure you get one that fits your largest lens and step down from there.
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43 of 45 people found the following review helpful By ryan on July 29, 2008
Size Name: 77mm Verified Purchase
Paired this polarizing filter to my Canon 17-40mm F/4L lens on a Rebel XT (1.6x Crop) and it works great. As you turn the filter the change in the image through the viewfinder is night and day. Creates a nice blue sky and gives more "pop" and contrast to clouds. Also eliminates reflections from plant leaves (you really have to see it for yourself!) to create a nicely saturated green only a filter of this type can produce. Must have for any outdoor photographer.

The "Kasemann" designation from my research stands for B+W's edge sealing of the glass. This is to prevent humidity and other types of weather from separating the foils inside. Over time regular polarizers can become hazy, etc. from that very problem. Just buy this one to keep for life instead of spending 50 dollars every few years. The filter frame is made out of brass, unlike other filters that are made of aluminum. This aids with smooth operation and eliminates binding.

I'm not entirely sure however if the wide angle of the 17-40mm needs a "slim" glass element (some say use of a regular polarizer with an ultra wide angle can cause an uneven polarization effect, however they are not clear if its on a crop body like the Rebel XT I'm using wit with). Some say a slim filter isn't needed, some do. I will have to do more outdoor shooting at the widest focal length to find out. Even so, B+W also produces a slim Kasemann version of this filter as well. From what i've seen though, vignetting is not a problem with the 17-40mm + this filter on a crop body such as the Rebel XT.

NOTE: I have also read that the way B+W produces the glass/foils will cause a "ripple" reflection effect in the glass when viewed at certain angles. This is true from what i've seen with my filter.
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