I get a lot of questions about how well the Sony body Sigma lenses combo works with autofocus tracking. The short answer is that its better than my old DSLR. Here is a full series of 23 images that I turned into a GIF. Every frame is TACK sharp. This is the Sigma 70-200 f2.8 S lens on the Sony a7III using the MC-11 converter. Aaron Carlson with the banger turns.