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OPTIMAL PRICES
Adorama: $329.00
for Minolta
Adorama: $329.00
for Sigma
Adorama: $329.00
for Pentax
Adorama: $329.00
for Canon
Adorama: $329.00
for Nikon
Adorama: $259.95
for Pentax

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

Sigma 28-70mm f/2.8 EX DG
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DESCRIPTION

It incorporates "Super Multi Layer Coating" to reduce the influence of harmful light caused by reflections from the digital image sensor.

This lens is also equipped with a zoom lock that eliminates "Zoom Creep". This remarkably compact, high performance zoom lens is ideally suited for traveling.

14 Elements in 12 Groups
Angle of View:  75.4 - 34.3 degrees
Number of Diaphragm Blades:  9 Blades
Minimum Aperture: f/22 
Minimum Focusing Distance:  33cm /13 in. 
Maximum Magnification  1:4.4
Filter Diameter: 67mm 
Diameter x Length: 74mm x 87.2mm (2.9 in. X 3.4 in.)
Weight:  510g/18.1 oz.
Corresponding AF Mounts: SIGMA, CANON, NIKON (D), MINOLTA, PENTAX
Nikon and Pentax mount lenses do not have an aperture ring.
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.
IFInner Focus. This lens moves the inner lens group or groups without changing the lens' physical length.

Comparison
by Whichlens.COM
http://www.whichlens.com/index.php?blog=5&title=tamron_28_75mm_f_2_8_xr_di_vs_sigma_28_7&more=1&c=1&tb=1&pb=1
Reviews
by Peter K. Burian, Shutterbug
http://shutterbug.com/equipmentreviews/lenses/1001sb_sigma/
by Koh Kho King
http://shashinki.com/review/others/sigmaex2870/index.htm
by Ian Andrews
http://www.ephotozine.com/equipment/tests/testdetail.cfm?test_id=353