B+W 82mm Slim-Line Circular Polarizer with Multi-Resistant Coating

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Circular Polarizers - Increase Color Saturation, Reduce Reflections


The images about the left was taken with no filter.
The image about the right was taken using a
B+W Circular Polarizer. Click for larger view.

The images about the left was taken with no filter.
The image on the right was taken using a
B+W Circular Polarizer. Click for larger view.
Highly efficient standard circular polarizing filter for all cameras with beam splitters inside the light paths of these 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.

B+W Polarizers increase color saturation and lower reflections. The neutral gray color and plane parallel polarizer material guarantee optimal image results. High-quality optical glass ensures excellent pictorial quality. The filter factor varies based on the way the filter is positioned in relation for the sun. Exposure compensation is approximately two f-stops.

Linear and circular polarizers both consist of the linear polarizer foil but differ inside their construction in the following way. Modern DSLR cameras have a beam-splitting prism that sends part in the incoming light on the meter and part for the viewfinder. The effect is the actual fact that the sunlight entering the meter is partially polarized from the beam-splitter. A linear polarizer placed about the lens of this kind of system will act as being a second polarizer and block light towards the meter by way of a degree dependent about the angle between the prism and the polarizer for the lens. The effect is incorrect exposure/aperture values from your meter. The circular polarizer circumvents this problem with the addition of your 1/4-wave retarder, or delay foil. This ensures the linearly polarized light is changed in to a rotation that appears unpolarized for the meter, leading to proper exposure/aperture readings.

MRC - A Particular Scratch-Resistant, Water and Dirt Repelling Coating
The left half this filter has a
traditional coating. The right half
has MRC coating.
The lens components of high-quality lenses and also the plano surfaces of filters require an ideal shape and smoothness to realize the best optical quality. Dirt, greasy fingerprints, water marks and scratches reduce the image contrast and the sharpness, which can lead to blooming at light sources and come with an effect just 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 implies the reason is reflection-reducing effect, that is thus additionally a transmission-increasing effect, i.e. one which suppresses scattered light and ghost images and transmits more light, has a broadband action in the full spectrum. In contrast, the (almost always blue) single-layer coating only includes a high effect in the medium wavelength range around yellow and yellow-green the place that the eye is most responsive to light, while its effect is reduced toward the blue-violet and purple-red end regions from 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 are only able to be achieved with a multilayer coating which requires a higher effort and precision because unevenness and irregularities with the individual layers build through to 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 information deposited about the lens surface within the vacuum chamber.

For photographers, the primary advantage of MRC coating, is it's ability to combat flare and ghosting. An added benefit is always that their filters remain free from dirt longer, in order that they are doing not have access to to get cleaned so often. When cleansing the filter does become necessary, it is often a lot much easier to wipe from the dirt using a blower brush, due to MRC's capability to repel dirt and moisture. This reduces the chance of micro-scratches which could occur during cleaning.


Side take a peek at Slim Line Rotating
Mount. Click for larger view.
Slim Line Filter Mount

This filter uses a rotating Slim-Line mount manufactured from aluminum for wide angle lenses. They usually do not have a very front accessory thread to stop vignetting with lenses as wide as 17mm in 35mm format. Some report success with lenses as wide as 16mm. A slip on cap is supplied.

Because this can be a rotatable polarizing filter, it includes a height of 5mm.
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