SLR-Camera Reviews

I bought this lens in October and loved it. It's great when it works, but the manufacturing sucks, and the lens came apart in under a year. I sent it in for warranty repair and got a bill. I spent HOURS on the phone with Sigma's repair department and, after being passed around from technician to manager to Sales Manager, I was told they'd pay for the repair labor, but I had to pay for parts. They were totally unconcerned with customer satisfaction, totally unconcerned with the reputation of their equipment. They just weren't going to fix the problem with the piece of equipment I paid $800 for. Sigma makes a great product, but isn't at all concerned with customer Satisfaction

What I have read in other websites supports Monica's comment,it's all in one lens.

This is an excellent tool to make better photography though the art is in your "eye". It's small and lightweight, and a very useful feature is that it covers almost all lens sizes, which allows you to carry only one lens on your gadget bag so you can make from wide angle to close-up shuts without having to switch between lenses.
Just Excellent!!!

This is aspherical zoom lens is a 2 in 1 zoom lens taking care of 28-70mm and 70-210mm zoom lens so no more lens changing hassles.

The results from this lens has come out very well and the crispness, clarity, exposure and sharpness are quite satisfying.

It's quite compact and lightweight but not as light as the Tamron's 28-200mm. But then I guess weight does add sturdiness and strength to a product.

It's got a very good aperture range of 3.5-5.6 for such a huge focal range. The aspherical design has added to it's compactness. Due to the non-rotating filter mount, using of polarizers has become easier.

On the downside the depth of field is the only casualty in the mid to tele range compared to smaller range zooms.