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Sigma 18-50mm F3.5-5.6 DC

18-50
Review Date: May 1, 2004 Recommend? yes | Price paid: $106.00 | Rating: 8 

 
Pros: Light, Cheap, good wide angle coverage, relatively sharp
Cons:
light, rotating front while focusing, AC motor, limited camera compatiblity to 1.5x crop or higher.

This is a pretty compact lens. If you don't want to pay or lug around a 17-40L, this is definitely a cheaper alternative. It produces images of similar and slightly better quality than the 18-55mm canon kit lens. The build quality is much better also. However, I found the AC motor to be very loud and seems like it might break over time. Especially when Sigma warns not to crank the focus ring while in AF mode, but when you put on the front cap, you inadvertantly twist the AC motor. So, potential for damage is higher than an internal focusing system. But overall, if stopped down to around f8, the images come out quite clear, constrasty, and relatively sharp. For a wide angle, this is hard to beat. Only other major concern is the 1.5x crop requirement. If placed on a 1.3x, it will vignette heavily. But at least it is compatible with all other 1.5x crop cameras whereas the kit lens is not. If you have a 10D and want the cheaper kit lens alternative, this is the obvious choice.

A very good lens for the price.