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OPTIMAL PRICES
Adorama: $439.00
for Nikon
Adorama: $439.00
for Canon
Adorama: $439.00
for Minolta
Adorama: $389.95
for Nikon
Adorama: $439.00
for Sigma

*Price is a changeable thing. Click the link to see the price for today.
     

Sigma 20-40mm f/2.8 EX DG ASPHERICAL
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DESCRIPTION

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 / 11.8 in. 
Maximum Magnification  1:4.6 
Filter Size  Diameter: 82mm 
Diameter x Length: 89mm x 107.8mm (3.5 in. x 4.2 in.)
Weight: 595g / 20.9 oz.
Corresponding AF Mounts:  SIGMA, CANON, NIKON (D), MINOLTA(D), PENTAX

LEGEND
AFAuto Focus
ASPAspherical lenses. Provides distortion-free images with image reproduction performance equivalent to that of a single focal length lens. Aspherical lenses allow the production of high-quality images from compact, lightweight telephoto zoom lenses.
DGThese 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.
EXThe exterior of this lens is EX-finished to denote the superior build and optical quality, and to enhance its appearance.

Reviews
by Peter K. Burian, Shutterburg
http://shutterbug.com/equipmentreviews/lenses/0402sb_sigma/
by Heather Powell
http://www.ephotozine.com/equipment/tests/testdetail.cfm?test_id=117