- Canon EF 50mm lens
The EF 50mm lenses are a group of normal 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.
When used on a digital EOS body with a
field of view compensation factor of 1.6x, such as theCanon EOS 400D , it provides a narrower field of view, equivalent to an 80mm lens mounted on a 35mm frame body. With a 1.3x body such as theCanon EOS-1D Mark III It provides a less narrow field of view, equivalent to an 65mm lens mounted on a 35mm frame body.Six EF 50mm lenses have been developed and sold. Two of are L series lenses and three have
Ultrasonic motor s.Since the f/1.2L, f/1.4 and f/1.8 lenses can provide very similar wide-aperture shots but have very different price tags, they have naturally been the subject of many in depth comparisons.
*1.0L USMcite web
url=http://www.canon.com/camera-museum/camera/lens/ef/data/standard/ef_50_10l_usm.html
title=EF 50mm f/1.0L USM
work=Canon Camera Museum
author=Canon Inc.
accessdate=2007-08-06] (discontinued, replaced by f/1.2L)
*1.2L USMcite web
url=http://www.canon.com/camera-museum/camera/lens/ef/data/standard/ef_50_f1.2l_usm.html
title=EF 50mm f/1.2L USM
work=Canon Camera Museum
author=Canon Inc.
accessdate=2007-08-06]
*1.4 USMcite web
url=http://www.canon.com/camera-museum/camera/lens/ef/data/standard/ef_50_14_usm.html
title=EF 50mm f/1.4 USM
work=Canon Camera Museum
author=Canon Inc.
accessdate=2007-08-06]
*1.8cite web
url=http://www.canon.com/camera-museum/camera/lens/ef/data/standard/ef_50_18.html
title=EF 50mm f/1.8
work=Canon Camera Museum
author=Canon Inc.
accessdate=2007-08-06] (discontinued, replaced by f/1.8 II)
*1.8 IIcite web
url=http://www.canon.com/camera-museum/camera/lens/ef/data/standard/ef_50_18ii.html
title=EF 50mm f/1.8 II
work=Canon Camera Museum
author=Canon Inc.
accessdate=2007-08-06]
*2.5 Compact Macrocite web
url=http://www.canon.com/camera-museum/camera/lens/ef/data/standard/ef_50_25.html
title=EF 50mm f/2.5 Compact Macro
work=Canon Camera Museum
author=Canon Inc.
accessdate=2007-08-06]EF 50mm f/1.0L USM
The EF 50mm f/1.0L USM is a professional L series autofocus lens, that is now discontinued. It was the only f/1.0 lens that Canon made for the EF mount. This lens is constructed with a metal body and mount, and with plastic extremities. Features of this lens are a wide rubber focus ring that is damped, a distance window with infrared index, and the ability to set the focus range from 0.6m to infinity, or 1m to infinity. An 8-blade, maximum
aperture of f/1.0 gives this lens the ability to create extremely shallowdepth of field effects, and to be used in very-low-light situations. The optical construction of this lens contains 11 lens elements, including two ground and polished aspherical lens elements. This lens uses a floating front extension focusing system, powered by a ring-type USM motor. The front of the lens does not rotate, but does extend when focusing.EF 50mm f/1.2L USM
The EF 50mm f/1.2L USM is a professional L series lens, it was designed to replace the EF 50mm f/1.0L USM. It is the shorter of the only two f/1.2 lenses Canon makes, the other being the EF 85mm f//1.2L USM. It is constructed with a metal body and mount, and plastic extremities. This lens features a wide rubber focusing ring that is damped, a distance window with infrared index, and is weather-sealed. A circular, 8-blade, maximum aperture of f/1.2 gives this lens the ability to create very shallow depth of field effects. The optical construction of this lens contains 8 lens elements, including one ground and polished aspherical lens element. This lens uses a floating front extension focusing system, powered by a ring-type USM motor. The front of the lens does not rotate, but does extend when focusing.
EF 50mm f/1.4 USM
The EF 50mm f/1.4 USM is a consumer-level lens. It is constructed with a plastic body and a metal mount. This lens features a distance window with infrared index. An 8-blade, maximum aperture of f/1.4 gives this lens the ability to create shallow depth of field effects. The optical construction of this lens contains 7 lens elements, without any special lens elements. This lens uses a front extension focusing system, powered by a micro USM motor. Even though this lens uses a micro USM motor, it still has FTM (full-time manual focus) available. Auto focus speed of this lens is fast, but not as quick as most ring-USM-based lenses. The front of the lens does not rotate, but does extend when focusing.
EF 50mm f/1.8
The EF 50mm f/1.8 is a discontinued economy level lens, which has been replaced by the EF 50mm f/1.8 II. It is constructed with a plastic body and a metal mount, and features a distance window with infrared index. A 5 blade maximum aperture of f/1.8 gives this lens the ability to create depth of field effects.
The optical construction of this lens contains 6 lens elements, with no special elements. This lens uses a front extension focusing system, powered by an AFD motor, Front of the lens does not rotate when focusing, making it compatible with circular polarisers.
Auto focus speed, despite the AFD motor, is moderately fast although audible.
EF 50mm f/1.8 II
The EF 50mm f/1.8 II replaced the EF 50mm f/1.8. Because of its low price but relatively high optical quality, this lens has excellent value. It is constructed with a plastic body and mount and has a very simple design with no features.
Changes compared to the mk I model are the plastic mount, the absence of a distance window, a micro motor instead of an arc-form drive and a rotating lens front. Optically, this lens is almost identical to the first version.
The focus ring on this lens is even smaller than the one on the mk I model and placed on the front of the outer barrel. Also unlike the earlier model, it isn't decoupled in AF-mode, so accidently turning it can cause damage to the autofocus mechanism.Fact|date=October 2008
EF 50mm f/2.5 Compact Macro
The EF 50mm f/2.5 Compact Macro is a consumer-level macro lens. It is constructed with a plastic body and metal mount. This lens features a distance window with infrared index, and magnification markings on the extending lens barrel. A 6-blade, maximum aperture of f/2.5 means this lens is not suited for depth of field effects, except at short focus distances. The optical construction of this lens contains 9 lens elements, without any special lens elements. This lens uses a front extension focusing system, powered by a micro motor. Auto focus speed of this lens is moderate, and does make sound. The front of the lens does not rotate when focusing, but it does extend considerably.
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