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B+W 58mm Slim-Line Circular Polarizer with Multi-Resistant Coating

Product Description

High Quality German Filters

From the Manufacturer

Circular Polarizers - Increase Color Saturation, Reduce Reflections

The images on the left was taken without any filter.
The image on the right was taken using a
B+W Circular Polarizer.
The images on the left was taken without any filter.
The image on the right was taken using a
B+W Circular Polarizer.

Highly efficient standard circular polarizing filter 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.

B+W Polarizers increase color saturation and reduce 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 according to how the filter is positioned in relation to the sun. Exposure compensation is about two f-stops.

Linear and circular polarizers both consist of a linear polarizer foil but differ in their construction in the following way. 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. The circular polarizer circumvents this problem through the addition 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 Slim Line Rotating
Mount.

Slim Line Filter Mount

This filter uses a rotating Slim-Line mount made of aluminum for wide angle lenses. They do not have a front accessory thread to avoid 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 is a rotatable polarizing filter, it has a height of 5mm.


Circular Slim-Line 58mm B+W Polarizer Coating Multi-Resistant with Polarizing Filters

by william nagel

the radiator keeps your vehicle's engine cool during a drive; but when your radiator is leaking coolant, the engine can overheat and suffer serious damage. if you are far from a garage and your radiator is leaking, you can use eggs to patch small holes and temporarily plug the leaks. heat from the radiator will cook the egg whites, and pressure will force the eggs into the holes, fixing the leaks long enough to take your car to a garage for repairs.

Circular Slim-Line 58mm B+W Polarizer Coating Multi-Resistant with Polarizing Filters

allow the radiator to cool. test the temperature of the radiator by carefully touching the radiator hose; do not continue if the radiator hose is still hot.

step 2

cover the radiator cap with a towel or rag, and slowly twist the cap to open the radiator. let any steam dissipate before fully opening the radiator.

step 3

crack an egg gently into two halves over the bowl. pour the yolk back and forth between the shell halves, and let only the white run into the bowl.

step 4

pour the egg white from the bowl into the radiator.

step 5

repeat steps 3 and 4 for the remaining eggs. separate and pour the whites into the radiator one at a time; if you spill the yolk, you won't ruin all of the whites.

screw the cap radiator cap back into place, and make sure it is secure before starting your car.

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Circular Slim-Line 58mm B+W Polarizer Coating Multi-Resistant with Polarizing Filters

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