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Sigma 18-50mm f/2.8 EX DC

Sigma 18-50mm f/2.8 EX DC Specifications
Frame Coverage APS-C
Lens Construction (groups) 13
Lens Construction (elements) 15
No. of Diaphragm Blades 7
Minimum Aperture 22
Closest Focusing Distance 0.28m (11")
Maximum Magnifcation 0.20x
Filter Diameter 67mm
Maximum Diameter x Length 74.1mm x 84.1mm (2.9" x 3.3")
Weight 445g (15.7oz)
This lens is small for an f/2.8 model and although it suffers slightly at the wide-open aperture the focusing ability throughout the focal range warrants the aperture. From f/4 onwards it is a cracking lens that is light enough to have fitted to the camera permanently as a walk-round lens.
Nick Johnson
Its sharp enough in testing, shows to be very sharp in real usage, focuses plenty fast and accurately, the out of focus area looks pleasing to me, and it cost me 1/10th the cost of a 1D mark II with a couple of batteries and new CF cards.
The lens is sharp at f/8.0 to f/16 throughout its range, very good at f/5.6 and f/22, and usable at f/2.8 though rather soft.
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