B+W Filters 62mm Top-Pol Linear Polarizing Glass Screw In FilterWith B+W polarizing filter, reflections on glass, lacquer, on nearly all plastic materials and other electrically non-conduction surfaces can often be reduced or even eliminated. B+W Polarizing Filters provide you the control over how much reflection you wish to remain because the light reflected at an angle of about 40° to 70° by these surfaces is strongly polarized. Its transmission can be reduced, blocked or even enhanced (!) in relation to the remaining unpolarized light, depending on the rotation of the filter. Thus a clear view is made possible through plates of glass, of goldfish below the surface of the water, or of writing or pictures behind a glossy layer of lacquer.
Every object outdoors reflects light from the sky more or less diffusely and largely polarized, some objects, such as green plants and red roof tiles are covered by a bluish-gray veil that can make them appear pale and dirty. B+W Polarizing Filters can remove this polarized veil and thus increase the saturation of the true color. Because the blue light from the sky, especially at an angle approximately perpendicular to the sun is strongly polarized, a polarizing filter can be used to render the sky with a more saturated color, so that white clouds will stand out more dramatically. Using a polarizer for black-and-white film, reflections can be accentuated or reduced, and can have higher image contrast.
B+W "Kaesemann" Polarizing Filters
The "high-end" polarizing foils of the Kaesemann-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. The resulting sandwich is then precision-polished again to achieve highly accurate plano-parallel surfaces. Subsequently they are edge-sealed to protect the foil against humidity. Brass mounts made on CNC-controlled machines ensure precise seating on the lens. Discriminating photographers regards the B+W Kaesemann-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.
Better view with cementing
Unlike some other polarizing filter, B+W Polarizing Filters do not consist of a plastic polarizing foil loosely sandwiched between two protective glass discs. Instead, the polarizing foil is cemented to both glass discs for much better optical quality. Even the tiniest surface irregularities on plastic polarizing foils, which can not be produced as smoothly and as evenly as polished glass, are evened out by this process. The number of reflective glass-to-air or foil-to-air surfaces is reduced from six to only two. B+W Polarizing Filters are distinguished by their higher light transmission, brilliance, and yield excellent detail even in the shadow areas. This preserves the full image-quality of the lens.
Polarizers are multi-talented
Experienced photographers consider polarizing filters to be the most important filters. Their ability to reduce or eliminate reflections is probably their best-known feature, but it is not the only one. They enhance the color purity of the subject (increased color saturation) by blocking the blue veil of light from the sky. They increase the contrast in black-and-white photographs, reduce haze, and make white clouds stand out dramatically from an intensely blue sky. When the filter is rotated by 90° from its normal reflection reducing position, it can even appear to increase the relative intensity of reflections on water, glass, lacquer and plastic materials up to a factor of 2.