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+--- Thread: Sigma firmware updates for the MC-11 and the 150-600mm (C & S) (/showthread.php?tid=520)
Sigma firmware updates for the MC-11 and the 150-600mm (C & S) - stoppingdown - 10-28-2016
http://www.sigma-global.com/en/download/lenses/firmware/
Various things, including AF accuracy improvements. Let's see...