Sigma EX 20-40mm F2.8 DG Lens Pentax

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SKU: 4513945

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Sigma has created a new 20-40mm lens with f/2.8 throughout its zoom range, from ultra-wide 94.5 degree to near-standard 56.8 degree angle of view, allowing photographers to shoot more creatively from various angles and zoom perspectives. With a fast f/2.8 maximum aperture, superior peripheral brightness is ensured. This lens is perfectly suited for indoors, even in dim light. These features also make this lens desirable for use with Digital SLR Cameras.

The 30cm minimum focusing distance is useful for closeups, giving photographers plenty of capability to use the zoom to adjust composition and concentrate on detail. Maximum magnification is 1:4.6. A short focus distance and a minimum aperture of f/22 provides greater depth of field.

Aspherical lens elements in front and rear lens groups compensate for astigmatic and spherical aberration, respectively. By reducing aberration to an absolute minimum, this lens overcomes a major impediment to zoom lens performance.

Among the practical high-performance features of the lens are DF (Dual Focus) mechanism for optimal handling stability during autofocus operation; a wider-than-conventional focus ring for superior manual focusing operation; and an inner focusing system that eliminates front lens rotation during focusing, and allows use of the standard petal-type hood accessory, which is excellent at blocking out extraneous light.


Sigma EX 20-40mm F2.8 DG Lens Pentax

Weight 595g / 20.9 oz.
Length 107.8mm/4.2 in.
Filter Diameter 82mm
Min. Focus 30cm / 11.8 in.
Max. Magnification 1:4.6
Diagonal FOV Not Spcified by the Manufacturer
Horizontal FOV 94.5 - 56.8 degrees
Horizontal FOV on Digital 63 – 37.9 degrees
Min. Aperture F22
Optical Construction 17 Elements in 13 Groups
Autofocus Yes, screwdrive

SKU 4513945
Barcode # 085126513450
Brand Sigma
Unit Of Measure ea

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