Manufacturer’s Description

This super wide angle lens is ensured minimal light-fall-off with superior peripheral brightness. The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background. This is an ideal DG lens optimized Digital SLR camera. The lens incorporates Dual-Focus (DF) mechanism. It is easy to hold the lens, since the focusing ring does not rotate during auto-focus, yet it provides adequate focusing torque of the focusing ring during manual focusing of the lens.

The Specs

Physical Specifications
Length 3.4 in
Dimensions 3.50
Diameter 3.5 in
Weight 1.15 lbs
Warranty
Warranty Information 1 Year Limited Warranty
More Info
URL http://www.sigma-photo.com
Additional Specifications
Brand Name Sigma
Lens Construction 13 Elements in 11 Groups
normalized-Weight 18.4
f/Stop Minimum 22
Angle of View 94.5 degrees
f/Stop Maximum 1.8
Parent Retsku B0064I7GH2
Optics
Filter Size Supported 82 mm
Min Focus Distance 7.87"
Min Focal Length 20 mm
Quick Glance
Lens Type Super Wide Angle
Max Aperture f/ 2.8
Compatible Camera Mount Canon EOS SLR Cameras
Max Focal Length 20 mm

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