Sigma's 17-70mm f/2.8-4 DC Macro OS HSM lens is an upgrade to the AF 17-70mm f/2.8-4.5 DC Macro lens released in 2006. Designed for the smaller imaging circle of cameras with APS-C sized sensors, it is slightly larger and heavier than its predecessor and has a more complex optical construction. It also includes Sigma's Hyper Sonic Motor (HSM) technology for fast and quiet autofocusing.
This page contains a snippet of article „Sigma AF 17-70mm f/2.8-4 DC Macro OS HSM Lens“. The article was originally published on Photo Review at http://www.photoreview.com.au/reviews/cameraaccessories/sigma-af-1770mm-f284-dc-macro-os-hsm-lens.aspx. ShutterNews.com isn't responsible for the article's content.
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Fri, 2010-02-19 15:05