EX (EX Lens)
The exterior of this lens is EX-finished to denote the superior build and optical quality, and to enhance its appearance.

IF (Inner Focus)
To ensure stability in focusing, this lens moves the inner lens group or groups without changing the lens' physical length.

ASP (Aspherical Lens)
The aspherical lens complex allows freedom of design, improved performance, a reduced number of component lenses and a compact size.

DG (DG for DIGITAL & FILM)
These are large-aperture lenses with wide angles and short minimum focusing distances. With an abundance of peripheral illumination, they are ideal lenses for Digital SLR Cameras whilst retaining suitability for traditional 35mm SLRs.

20-40mm f/2.8 EX DG ASHPHERICAL

A Large-aperture-wide-zoom lens from 20mm with large F2.8 aperture

SIGMA has created a new 20-40mm lens with F2.8 hroughout its zoom range, from ultra-wide 94.5 degrees to near-standard 56.8 degrees angle of view, for photographers to shoot more creatively from various angles and zoom perspectives. With a fast F2.8 maximum aperture superior peripheral brightness is ensured. This lens is perfectly suited for indoor shootings even in dim light without worrying about blurring in photos. These features also make this lens desirable for use with Digital SLR Cameras.

30cm minimum focusing distance throughout the zoom range
The lens' 30cm minimum focusing distance is useful for closeups, giving photographers plenty of capability to use the zoom to adjust composition and concentrate on detail, as desired. Maximum magnification is 1:4.6. A short focus distance and a minimum aperture of F22 provides greater depth of field.

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

Sophisticated, yet simple to use
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 focal 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.

Fixed Petal-type hood is incorporated
This lens is equipped with a fixed Petal-type hood to obtain a superior extraneous light-blocking effect.

Price: £248

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Lens Construction
17 Elements in 13 Groups

Angle of View
94.5 - 56.8 degrees

Number of Diaphragm Blades
9 Blades

Minimum Aperture
F22

Minimum Focusing Distance
30cm

Maximum Magnification
1:4.6

Filter Size
82mm

Dimensions
Diameter 89mm X Length 107.8mm

Weight
600g