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Sigma 20mm f/1.8 AF RF EX DG Aspherical

Photos - Camera Lens Sigma 20mm f/1.8 AF RF EX DG Aspherical
$269.00 
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Sigma 20mm f/1.8 EX DG ASP RF Lens for Nikon DSLRs 411306

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Sigma 20mm f/1.8 AF RF EX DG Aspherical
$269.00 
Sigma 20mm f/1.8 AF RF EX DG Aspherical
Lens type
wide angle
System
Canon
Nikon
Minolta
Pentax
Sigma
Sony
Mount
Canon EF
Nikon F
Pentax K
Sigma SA
Sony A
Focal length
20 mm
Aperture value
f/1.8
Viewing angles
94.5°
Min. diaphragm
22
Minimum focus distance
0.2 m
Maximum zoom
0.25
Sensor size
full frame/APS-C
Autofocus drive
is absent
AF drive (screw driven)
Internal focus
/ rear lens /
Design (elements/groups)
13 elements in 11 groups
Number of diaphragm blades
9
Filter diameter
82 mm
Dimensions (diameter/length)
88.6x89.5 mm
Weight
520 g
Added to E-Catalog
november 2006

. A wide-angle prime that combines a high aperture of f/1.8 with a 9-bladed aperture to capture images with soft background blur. Focal length — 20 mm. Available in modifications for Canon (EF mount), Sony / Minolta (A mount), Nikon (F mount), Pentax (K mount) and Sigma (SA mount) systems; regular matrix type — full frame. Autofocus drive — type "screwdriver".

Everything is relative: interchangeable lenses for cameras from third-party manufacturersLenses from alternative brands: money down the drain or an increase in image quality?
Information in model description is for reference purposes.
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Short description:

The 20mm ultra wide-angle lens provides a 94.5° angle of view and a fast aperture (F1.8). The minimum focus distance of the lens is 20 cm, and the working distance to the object is 6.5 cm. The use of aspherical elements in the optical design makes it possible to effectively combat the occurrence of distortion, chromatic aberration and astigmatism. Uniform brightness across the entire field of the frame and the absence of vignetting distinguish this lens from its classmates. Thanks to the rear focus system, when focus, the front lens of the lens does not rotate, which allows the use of a petal hood.

The lens comes in a kit for Canon EF, Konica Minolta AF, Nikon AF, Pentax AF or Sigma AF mounts.
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