Sigma 10-20mm f/4-5.6 EX DC HSM Lens review

It’s available in all the same mounts as Sigma’s new, constant-aperture version of the lens, as well as in Olympus Four Thirds mount (although the effective zoom range of 20-40mm is less impressive

Sigma 10-20mm f/3.5 EX DC HSM

Both Sigma lenses use the company’s HyperSonic Motor (HSM) autofocus, which is practically as quiet as the equivalent Canon and Nikon systems, although it proved rather slower in our tests.

Pentax 12-24mm f4 DA ED AL IF Lens review

The lens is still pretty quick, and offers full-time manual focus override, but even the Olympus 9-18mm lens manages this trick, and the Pentax autofocus is much noisier.

Nikon AF-S DX 10-24mm f/3.5-4.5 G ED Lens Review

It’s almost exactly the same size as the Canon 10-22mm, but a little heavier, and build quality is of a similarly high standard.

Canon EF-S 10-22mm f/3.5-4.5 USM Lens Review

Although it’s quite light and feels balanced on a camera body like the EOS 450D or 500D, the lens is robust and well engineered.The UltraSonic Motor (USM) autofocus system proved incredibly f