They both offer zoom function in the 70mm to 200mm range, f/2.8 wide-open aperture for low-light work, and provide super-quiet auto-focus operation with ...

The lens is very solid and sturdy, yet not very heavy. Focus ring has full throw, rather than the very short throws on zoom lens, which may be why AF is slow.

The Sigma 24-60mm F2.8 EX DG Lense is one of sigma's latest professional lens creations. Although simple in design, the overall lens offers a stunning array of ...

The Sigma 28-105 is good for the money. It is a bit soft. I like using it for portrait and B&W photos. I like it with B/W because I do not like ...

Sigma APO 70-200mm F2.8 II EX DG MACRO HSM Won't Auto-Focus. Well I love the lens when it was working. Im at a soccer game yesterday shooting my two ...

A solid-built ultra wide-angle lens.

I managed to continue using it for quite some time. But not being able to use auto-focus on an AF-capable lens bothered me. Finally, I decided to disassemble it ...

The auto-focus mechanism on this lens is based on Canon's micro motor. It is noisy and doesn't sound very smooth. In low-light and low-contract situation, it ...

Personally, I've encountered auto focus problems with my Sigma AF105mm macro lens ever since I've had it. I find that sometimes AF is completely redundant in ...

The lens gets designed to give a best performance with digital SLR cameras and 35mm film cameras. This lens contains two special low dispersion elements. It ...