Lloyd Chambers as well as some forum members over at DPReview say the latest updates have killed a7R III eye autofocus, so I was concerned about whether a7 III video autofocus with face detect might have been affected as well. Anyhow, face detect AF seems to work the same as before: which is to say that if my chin is closer to the camera than my forehead, it’s going to focus on my chin! As usual, detail has been dialed down to -7.
A down and dirty autofocus test with the a7 III, firmware v.3.0 (both camera and lens). The Samyang’s a pretty chubby affair – it just barely clears the base plate on my Zhiyun Crane Plus – but is remarkably light for an 85mm f/1.4. When it comes to autofocus, the Samyang isn’t a speed demon but I would mostly be using it for portraiture, not action; and for video, gradual transitions look better in my opinion than too sudden and jarring. Hopefully future firmware updates will improve acquistion speed somewhat. The price is definitely competitive and I can see this being a hit with wedding, portrait and fashion photographers. I mustn’t fail to mention though, that you’ll either want to pick up the Samyang Lens Station for firmware updates – adding a substantial $60.00 or more to the cost – or purchase from a local dealer who is willing to do updates for you free of charge.