A good alternative to any kit lens
The Sigma 18-50mm is geared toward shooters who want to replace their kit lenses with something slightly better. Build quality is quite good and the lens doesn't change length when zooming! Center sharpness is also good, OS works quite well and everything works as it should. Quite a bit bigger than most kit lenses, but also 2/3 of a stop faster at all focal lengths.
Check out my complete review here: http://juhoaj.blogspot.com/2011/10/sigma-18-50mm-f28-45-dc-os-hsm.html
Rather high CAs, though these can be corrected. Quite soft at the edges, especially fully open.
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