There's no question in my mind that the FX6 offers the best auto-focus capability of any video camera ever made by any manufacturer. But you can't just take the camera out of the box and use the default settings.
I was on my way home last Sunday afternoon from another shoot when I noticed quite a few people riding Jet Skis on a local river. So, I took the opportunity to experiment with shooting some 4K high-speed action footage (120 fps) without ever touching the manual focus ring on my 200-600mm lens and 2.0x teleconverter, which is equivalent to a 1200mm lens). Everything in this video was shot over a period of about 45 minutes without ever using manual focus. I would just tap on the camera's LCD to tell it where I wanted to focus and then the camera would take over. Sometimes the camera would even automatically switch over to Face Detect auto-focus when people became prominent in the frame. I think the AF did an amazing job and it rarely missed. BTW, I've cut these clips short just to make a more interesting highlights video, but almost all of the clips run for 15-20 seconds . . . with perfect focus.
In case you're interested in learning about my FX6 auto-focus settings and techniques, I've posted a video I produced last spring after firmware 2.0 was released.
Camera: Sony FX6
Lens: Sony 200-600mm with 2.0 teleconverter
Tripod: Sachtler Aktiv8 head and Flowtech75 legs
Codec: 4K XAVC-I @ 23.98
Slow-motion: S&Q MOtion @ 120 fps
Shooting Mode: S-LOG3
Grading: DaVinci Resolve
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