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In photography, manual focus override, also known as full-time manual focus, allows manual intervention in the autofocus acquisition process simply by turning the focus ring on a photographic lens. There are a number of technologies used to implement this feature.
The lens has a self-contained autofocus system that does not require autofocus electronics in the camera body. Canon, unlike Minolta and Nikon, was convinced that having the motor in the lens was the optimal approach; this line of thinking continued with the new EOS system in 1987, which remains Canon's standard mounting system for SLRs today.
Phase-detection autofocus "sees" through window glasses without problems and is much more accurate, but it does not work in low-light conditions or on surfaces without contrasts or with repeating patterns. A very common example of combined usage is the phase-detection auto-focus system used in single-lens reflex cameras since the 1985s. The ...
A-DEP: [3] Canon also offers A-DEP (Automatic DEPth of field) mode on some cameras, which sets the depth of field and focus in a single shot. However, this requires lining up both the nearest and further objects on autofocus points at the same time, which may be difficult.
The Canon AL-1 was an FD mount, 35mm single-lens reflex camera introduced in March 1982. [1] [2] Its main feature was the "Quick Focus" focus-assist system [3] that was aimed at those who had trouble focusing through the viewfinder—either novices, or those with poor eyesight—and was intended to head off competition from the first full-autofocus cameras from other manufacturers, such as the ...
The Canon Extender EF lenses are a group of teleconverter lenses made by Canon. These lenses are used between any compatible EF type lens and any of the Canon EOS line of cameras. When used with a compatible lens, they will multiply the focal length of the lens by a factor of either 1.4x or 2x, at the cost of decreasing the lens' aperture by 1 ...
The Canon AF35M, by Canon Japan or the Sure Shot by Canon USA, was Canon Inc.'s first autofocus 35mm lens-shutter compact camera. [ 1 ] [ 2 ] It was launched in November 1979 [ 1 ] and received the Japanese Ministry of International Trade and Industry's 1980 Good Design Award in September 1980. [ 2 ]
In 1987 Canon was the first to use USM (Ultrasonic Motor) with the Canon EF 300mm f/2.8L USM. [19] In 1989 Canon was the first to create a full frame f/1.0 AF (AutoFocus) lens and the only one until today with the Canon EF 50mm f/1.0L USM. In 1993 Canon was the first to create an interchangeable 10× superzoom lens for SLR cameras.