Sigma 20-40mm f/2.8 EX DG Aspherical

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Lens Specifications
Name Sigma 20-40mm f/2.8 EX DG Aspherical
Image Circle 35mm
Type Wide Zoom
Focal Length 20 - 40mm
APS Equivalent 1.5x: 30 - 60mm; 1.6x: 32 - 64mm
Max Aperture f/2.8
Min Aperture f/22
Diaphragm Blades 8
Lens Construction 17 elements in 13 groups, including 2 aspherical elements
Diagonal Angle of View(Based on image circle) 94.5 to 56.8 degrees
Focus Details Internal with Dual Focus mechanism
Front Element Rotation No
Zoom System Rotary
Closest Focus 27cm / 10.6 in.
Magnification Ratio 0.22x / 1:4.6
Filter Size 82mm
Dimensions(Length x Diameter) 107.8mm x 89mm / 4.2 in. x 3.5 in.
Weight 595g / 20.9 oz
Notes Available AF Mounts: Sigma, Canon, Nikon, Minolta, Pentax
Typical Online Price US$449.99