A standard zoom for APS-C, this is a direct competitor to Canon's 17-55mm f/2.8 lens...

Effective four-stop stabiliser; f/2.8 constant aperture

Noisy autofocus; Middling sharpness at edges

I bought this lens used from someone on here. He mentioned the dial was stiff and it is. It's not so bad but I have to get used to gripping it instead of just zooming with one finger. I don't know if that is normal for a new one or not.

After a couple of months I started having issues with this lense. It would not focuss. Sometimes i have to press the shooting button several times before i can take the picture. I am very unhappy with this lense. I recomend you not to buy it. Moreover. Dust comes into the lense.

I've owned several copies of this lens. Initially, I used it on a Nikon D40 as a lightweight travel lens. I moved on to a D200, D300, and D7000. It performed best on the D7000. However, I moved to a full frame camera (D700) and sold my last copy.

Sharpness; weight

Focusing speed isn't extremely fast; but it hasn't been a problem.

I am verry pleased with this amazing lens ! It's a bit big and heavy, but I was suprised with the quality and the sharpness of the pictures ! I would highly recommend !

I am a Sports Photographer and I got this lens to go on my backup camera, Canon 7D. I used to have just a kit lens but with this lens things are so much better. I would recommend this lens to anyone shooting a cropped sensor.

Perfect for large aperture.

Easily Interchangeable; Fast / accurate auto-focus; Strong Construction

Heavy

The product is great because it has a very wide aperture for a zoom lens, without breaking the budget! It's also a constant f/2.8, so you have great aperture even when fully zoomed in.

"I've been borrowing my friend's TAMRON 17-50 (VC model) frequently over the past year and its great for what I do with my T3i. I do photography at a camp and this lens is super fast and sharp especially for the application.

This is the perfect lens for an upgrade from the kit lens. You'll be surprised at how much it increases the quality of your photos. I definitely recommend it as a staple lens for any photographer.