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.

Sigma DP2 Review

All makers but one use single-layer sensors, where the red, green and blue pixels are laid out in a pattern and the colour information for each pixel is interpolated using information from its neig

Sigma DP2

Megapixels alone don’t guarantee image quality.