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Some lens adapters include a special optical element called a telecompressor, focal reducer, or more recently a "speed booster", a genericised trademark that refers to the Metabones Speed Booster line of lens adapters. [2] This type of adapter is designed to reduce focal length, increase lens speed, and in some instances improve MTF performance.
A telecompressor or focal reducer is an optical element used to reduce focal length, increase lens speed, and in some instances improve optical transfer function (OTF) performance. It is also widely known under the name “Speed Booster”, which is the commercial name of a line of telecompressors by the manufacturer Metabones.
Lens speed is the maximum aperture diameter, or minimum f-number, of a photographic lens. A lens with a larger than average maximum aperture (that is, a smaller minimum f-number) is called a "fast lens" because it can achieve the same exposure as an average lens with a faster shutter speed .
The hopes of many NFL teams will start taking shape this week as the league's annual scouting combine begins in Indianapolis. Scouts are still trying to determine whether Heisman Trophy winner ...
Sony NEX-5 E-mount. The E-mount is a lens mount designed by Sony for their NEX ("New E-mount eXperience" [1]) and ILCE series of camcorders and mirrorless cameras. [2] The E-mount supplements Sony's α mount, allowing the company to develop more compact imaging devices while maintaining vignetting with 35mm sensors.
A closely related device reduces the focal length. It is generally marketed under the name speed booster, though the term telecompressor has also been used. It is used in particular to adapt DSLR lenses to mirrorless cameras. Here the magnification is less than 1, typically 0.71× or 0.64×.
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