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Tiffen - Filters 85 Linear Polarizer 4.5" Round Drop-In (DI) is the most popular special effect filter available.
The 85 color conversion aspect of the filter provides a warming effect and decreases the color temperature from 5500K to 3400K, allowing the use of tungsten balanced film in daylight conditions.
The linear polarizing aspect of the filter helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface. This results in a noticeable increase in the saturation of skies and foliage, as well as clearer imagery when photographing in hazy conditions. A linear polarizer differs from a circular polarizer in that it does not supports use of a camera's autofocus or auto exposure functions; it is best suited for use with manual cameras, such as view cameras, that are not dependent on internal mechanisms to determine focus or metering settings.There is a total filter factor of about 6x, requiring an increase of 2.6 stops for normal exposure. Tiffen filters are made using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and grinding flat to a tolerance of 1/10,000th of an inch. This filter measueres 4.5" / 114.3mm in diameter and is mounted within a metal ring. The non-rotating design of this filter is best-suited for use with lens hoods, adapters, or other rings for rotational control over the polarizing substrate.
Polarizers can create deep blue skies, provide a general saturation to all colors, reduce glare, and minimize reflections.
Screw-in Polarizers are featured with rotating mounts for precise control of polarization. It can also be used as an adjustable Neutral density filter, with up to two stops loss with full polarization.
Tiffen Tip: Polarizing filters achieve different effects depending on the photographer's position to the sun. To get maximum darkening of the sky, the photographer stands sideways to the sun (shoulders point to it) with the sun fairly close to the horizon. As he or she turns toward or away from the sun, the darkening is lessened. When the sun is directly overhead, only a small part of the sky near the horizon can be darkened. The Polarizer also removes unwanted reflections in highly reflective surfaces such as on cars or windows. CAT
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