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Zoom lenses are often described by the ratio of their longest to shortest focal lengths. For example, a zoom lens with focal lengths ranging from 100 mm to 400 mm may be described as a 4:1 or "4×" zoom. Typical zoom lenses cover a 3.5× range, for example 24–90 mm (standard zoom) or 60–200 mm (telephoto zoom).
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B4-mount of Fujinon A13x4.5 lens B4-mount of Panasonic AK-HC1500G camera. The B4 lens mount was standardized in 1992 by the Broadcasting Technology Association (BTA) and is defined in BTA S-1005. [1]
Minolta SR-mount lenses can be broken into three broad generations with some overlap: [5] Pre-MC (1958): Lenses with manual, preset, and automatic diaphragms, without the meter coupling (MC) tab on the aperture ring to signal the f-stop that was selected to the in-body light meter.
That way, the only control necessary on the lens is the manual focus ring (plus the zoom ring in the case of zoom lenses). [citation needed] The Maxxum 7000 had two 8-bit CPUs and six integrated circuits. A circuit on the lens relayed aperture information to the camera body, and the motor for autofocus was contained within the camera body.
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Sony also has an 11.08% ownership stake in Japanese lens manufacturer Tamron, [2] which is known to have partnered with Konica Minolta and Sony in the design and manufacture of many zoom lenses. Prior to the acquisition by Sony, the α branding had already been used on the Japanese market by Minolta for their AF camera system (marketed as ...
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