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Sony Cameras AF confusion / idiosyncrasies / advice


Ki Rin
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I'm having a bit of trouble finding consistent and reliable AF settings on my A7RII. And I am also quite confused by seeming idiosyncrasies between what AF modes can be used, and the function of various AF settings. 

In the Movie mode, things like Eye-AF do not work (I get a message about being unavailable in manual mode settings). However, with the dial set to custom, but the same manual settings applied, I seem to be able to use Eye-AF, as well as several other AF modes, that don't seem to be available in movie mode. On the other hand, things like framing guides do NOT show up in custom modes (but DO show up in movie mode).... 

Additionally, things like AF/MF Hold set to a custom button, seem to work only if MF is first set through the menu system, but will NOT work if set through a custom AF/MF toggle. 

All these little things, are causing me a lot of confusion when it comes to shooting video with the A7RII. I feel like all the AF settings on this camera are very confusing and full of caveats and workarounds. 
However, I have seen people praise the Sony AF as being quite good. So I'm wondering if anyone here can give me some advice on what settings are best to use for video AF. Especially for rapidly moving subjects. 

I've been experimenting with various modes, but am getting a lot of focus hunting and / or breathing, and don't feel very confident that my shots will be in focus. 

Any thought or advice on what settings  or modes work fairly reliably for video C-AF on sony a7rii? 

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AF on the a7r mk II at the time was pretty good, even with Canon lenses, but it was, and isn't really great. I was going to buy one for wildlife, BIF stuff, and talked to several people that owned them, and they said to pass on it because of sluggish AF, was how most described it. The newer cameras now are better. I guess Video AF is not an easy task to do.

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