Dan Watson has tested the a $6,000 dollar combo: Sony Alpha a9 w/ Sigma 135mm f/1.8 DG HSM Art lens using MC-11 adapter. From the video above, we see that the autofocus on Sony Alpha a9 is really good, and a9 eye’s tracking is also works great.
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Christoph Künne at Docma has posted first review of new announced Sigma 135mm f/1.8 DG HSM Art lens (B&H Photo Video/Adorama), he tested this lens on Sony a7RII with MC-11 Mount Converter/Lens Adapter. He said that Sigma 135mm f/1.8 Art lens’ background softening qualities are (almost) unrivaled, and appreciated by fashion photographers.