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"Face Priority in AF" in 4K filming (A7 III)


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I found a weird thing with my A7 III; when I tried to turn on "Face Priority in AF" in film mode, I got an error message: "This operation or setting not avaible as follows: File Format XAVC S 4K". What?!? The Face Priority AF is one of the main reasons I bought this camera, and I'm CERTAIN that I have seen movies on YouTube where this actually worked! Was it my Sigma MC-11 / Sigma 35/1.4 Art lens combination that did this? Well - after a bit of googling I found a solution; For some weird reason the Face Priority AF doesnt work in movie mode unless you turn on Flight Mode. It seems like the network functions needs to be shut off for it to work. I can't see why this is, and hope that this bug(?) gets fixed in a future firmware update. 

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