Over the last few years, Sigma has been making tremendous leaps in climbing up the reputation ladder. From a time when the name was just one of many in the third party lens manufacturer pool, the company now stands apart from all its earlier peers, often being compared to Zeiss. The Sigma Art series definitely earned the company some serious credibility as a third party lens manufacturer, but at the time, it was limited to prime lenses. With the introduction of the 24-70mm f/2.8 DG OS HSM, Sigma once again challenges the notion that first-party lenses are the best suited for your camera. Do they deliver?
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