Sigma 50mm f/1.4 EX DG HSM lens

50mm f/1.4 EX DG HSM
Maker Sigma Corporation
Technical data
Focal length 50mm
Aperture (max/min) f/1.4 - f/16
Close focus distance 45 cm / 17.7 in.
Max. magnification 1:7.4
Diaphragm blades 9
Construction 8 elements / 6 groups
Features
Short back focus  No
Ultrasonic motor  Yes
Lens-based stabilization  No
Macro capable  No
Application normal prime/portrait
Physical
Max. length 68.2mm / 2.7 in.
Diameter 84.5 mm / 3.3 in.
Weight 505 g / 17.8 oz.
Filter diameter 77 mm
Accessories
Lens hood Petal
Angle of view
Diagonal 45.8°
History
Introduction 2008
Retail info
MSRP $730.00 USD USD

The Sigma 50mm f/1.4 EX DG HSM is a normal prime lens made by the Sigma Corporation.

The lens is produced in Canon EF mount, Four Thirds System, Nikon F-mount, Pentax K mount, Sigma's own SA mount, and the Sony/Minolta AF Mount varieties, all have the same optical formula.

Technical information

The Sigma 50mm f/1.4 EX DG HSM is constructed with a plastic body and a metal mount. This lens features a distance window with depth of field scale. A nine-blade, maximum aperture of f/1.4 gives the lens the ability to create shallow depth-of-field effects. The optical construction of this lens contains eight lens elements, including one aspherical lens element. This lens uses a front extension focusing system, powered by a ring USM motor. Auto-focus speed of the lens is moderate; it is not as fast as most ring USM lenses. The front of the lens does not rotate, but does extend when focusing. The lens is designed so that the outer body barrel is longer than the inner lens barrel, when the inner lens barrel is at its longest extension. This results in the lens maintaining the same overall length no matter where the point of focus lies.[1]

When used on a digital crop body with a field of view compensation factor of 2× (Four Thirds body), it provides a field of view equivalent to a 100 mm lens mounted in a 35 mm body. In a 1.6× body, such as the Canon EOS 7D, it provides a narrower field of view, equivalent to an 80 mm lens mounted on a 35 mm frame body. With a 1.5× body such as the Nikon D300, it provides a less narrow field of view, equivalent to a 75 mm lens mounted on a 35 mm frame body. With a 1.3× body such as the Canon EOS-1D Mark III, it provides an even less narrow field of view, equivalent to a 65 mm lens mounted on a 35 mm frame body.

Advantages & Problems

This lens has shown to have lower vignetting than other Canon 50mm lenses.[2] It has been reported that quality control problems lead to some copies of this lens having problems attaining proper focus when using auto focus.[3]

See also

References

External links

Wikimedia Commons has media related to Sigma 50mm F1.4 EX DG HSM.

http://www.bythom.com/Sigma-50-HSM-lensreview.htm

This article is issued from Wikipedia - version of the Saturday, January 30, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.