Great price, (less than half the price of the Nikon or Canon equivalents) excellent build quality, well-designed tripod collar. Solid image quality. Great f/2.8 aperture.

No Optical Stabilization. Still have to use it more. Images are a bit soft at times but this is in low light. I expect better sharpness in better light.

Chose this because need a fast-focusing lens for basketball, Billiards and other low-light sports. So far haven't had any of the front or back-focusing problems I hear about with other Sigmas. But when I take it for my first