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The EF 85mm lenses are a group of medium telephoto prime lenses made by Canon Inc. that share the same focal length. These lenses have an EF type mount that fits the Canon EOS line of cameras. This 85mm focal length is "perfect for portraiture" as labeled by Canon and practicing professionals, due to the focal length creating just the right perspective for both the subject and the background. The 85mm is most commonly used for head and shoulder type portraiture, upper torso portraiture and selective floral photography. It will commonly be found in the kits of photographers that shoot wedding, birthdays, and other events involving people. These photographers would also carry a 70-200mm for complementing the longer focal lengths and when extreme depth of field is not needed. Three EF 85 mm lenses have been available. Two of these are L series lenses. * 1.2L USM * 1.2L II USM * 1.8 USM ==EF 85mm 1.2L USM== The EF 85mm 1.2L USM is a professional L series lens. Canon markets it as their "definitive portraiture lens". The lead optical engineer at Canon who led the design team for this lens was a fashion photographer, and his intention was to design a lens that would be the definitive lens for fashion photography. This required a completely new design that would take a new direction from Canon's previous 85mm lens designs. A new element was placed in the lens to give bokeh that was unlike any of the other lenses that fashion photographers had used before. This new large element required a new clutched electronic manual focusing mechanism that was only used on Canon's 50mm f/1.0 to handle the large specialized element. When it finally hit the market, it was the only lens in the industry that was explicitly designed for fashion photography. It is the longer of the only two 1.2 lenses Canon makes, other being the 50mm 1.2L USM. This lens is constructed with a metal body and mount, and with rubber gripping and plastic extremities. It features a wide rubber focusing ring and a distance window with infrared index. Featuring a circular 8-blade diaphragm, and a maximum aperture of 1.2, this lens is capable of maintaining sharpness and image quality at low apertures. The lens' depth of field allows distinct focus on the subject, while providing a beautiful bokeh. The optical construction of this lens contains 8 lens elements, including one ground and polished aspherical lens element, which makes this lens extremely sharp when stopped down to about 2. This lens uses a floating front extension focusing system, powered by a ring type USM motor. Auto focus speed of this lens is on the slow side when compared to most ring USM lenses, and photographing fast moving targets can be quite challenging with this lens. Manual focusing is done by wire: this lens does not have a direct mechanical connection to the focusing ring, but instead detects the rotation of the focusing ring and uses the autofocus motor to drive the lens elements. While full-time manual focus is available, the lens can not be focused when the camera is off. The front of the lens does not rotate, but does extend when focusing. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Canon EF 85mm lens」の詳細全文を読む スポンサード リンク
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