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The new firmware claims to improve the AF accuracy of the lenses when used with the Sigma Mount Converter MC-11.
Sigma has acknowledged a problem that Pentax users are suffering from when the company’s 17-70mm f/2.8-4 DC Macro HSM Contemporary lens is used on Pentax DSLR bodies with in-camera image stabilization activated. To rectify the issue the lens manufacturer has promised a firmware update for the lens, but hasn't yet specified a release date. Read more
Sigma has announced firmware updates for two of its most recent lenses. Version 1.02 for the 35mm F1.4 DG HSM A012 (Canon mount) and version 1.01 for the 17-70mm F2.8-4 DC Macro OS HSM C013 (Canon, Nikon and Sigma mounts) bring improvements to autofocus operation and, for the latter, optical stabilisation. The lenses must be updated using Sigma's USB Dock, and owners should download the latest Version 1.1 of Sigma Optimization Pro software first. Click through for more details and the download link.
Just posted: Our review of the Sigma 17-70mm f/2.8-4 DC Macro OS HSM | C. This lens occupies its own little niche in the market, as an upgrade to the typical 18-55mm zoom that offers both usefully extended zoom range and a faster maximum aperture. It also includes Sigma's 'Hypersonic Motor' for silent focusing, and built-in Optical Stabilisation. In the latest of our lens reviews prepared in partnership with DxOMark, we see whether it should be top of the short-list for SLR owners looking to progress beyond their kit lens.