Hello there, I'm currently using the Sony A7III with Samyang AF 14mm f/2.8 FE.
It might be a stupid question for you but whenever I am taking video with 'Face Detection in AF' on (AF-C mode, video format: 1080p, 50 fps), the face always has a grey frame on it. But it does not focus to it, I tried so many times but still did not make it happen. I tried focusing on other things, then moved to the face. The frame happened to appear again, but the focus point did not change a bit. I had to press the shutter to make it focus.
Is it because of the non-native lens, or is it a problem of my A7III???
Thank you for your kind reply.