This is very sharp with great colors and contrast lens. Super bokeh. Little bit noisy and not fast but image quality simply superb starting from F2.8.

Clear and accurate website Competitive prices Great comunications throughot keeping me informed of the progress o my order at all times

I bought this lens primarily for low light use since I like to shoot at night. So far so good. I have not critically tested the sharpness but casual observation indicate good resolution although not as good as the Nikon lenses. Mechanically it works great.

Consistent Output; Durable; Easily Interchangeable; Fast / accurate auto-focus; Lightweight; Strong Construction

The 17-70mm f2.8-4.5 DC Macro AF (Auto Focus) is Sigma's first digital only macro lens.

Sharp, fast, contrasty; Bargain price for its overall capabilities

Drag on the manual focus ring

This is a fantastic walk-about and general purpose lens for cropped sensor Digital SLRs -certainly for value for money, it's unbeatable. It does not feel cheap, the build quality is good, it feels sturdy and it comes with a zoom lock, which prevents the zoom sliding out when walking about.

Superb value for money; great image quality; good construction; high maximum aperture

Noticable barrel distortion at 17mm

Handling and features This 4.1x zoom lens for APS-C format cameras sports a variable f/2.8-4 maximum aperture, silent focusing, optical stabilisation and a closest focusing distance of 22cm throughout the zoom range.

This digital-only lens boasts excellent performance, Optical Stabilisation and a rock bottom price tag - so is there anything not to like?

Great all-round lens

Non-internal focusing

An upgrade of Sigma's digital-only macro lens (the 17–70mm f/2.8–4.5), this large-aperture standard zoom ($450, street) adds a tad more speed, another aspheric element (for a total of three), on-board image stabilization, and several ounces more in weight.

Daniel Lezano tests and rates the Sigma 17-70mm f/2.8/4 DC Macro OS HSM lens The majority of digital SLRs sold in the UK are supplied in kit form with an 18-55mm zoom, which while representing a good starter lens, isn't the sharpest of optics.

The Sigma 17-70mm F2.8 -4 DC Macro OS HSM is the practical zoom. A large-aperture, standard zoom lens for digital cameras with an open-aperture value of F2.8 (at 17mm) and covers the most frequently used focal lengths.