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I have a new A6400 with the Sony 18-55mm 3.5-5.6 OSS lens attached.  When I try to choose "AF-A" as the focus mode it says it's invalid with this lens.

Doesn't make sense to me... what am I missing ?

I was wanting to switch from continuous AF-C because during a recent interview shoot all I had was the man in front of me and focus tracking turned on.

It couldn't keep a sitting man is focus only 5 feet from me.  So I guess I need some help.  Been a photographer for 25 years... so I'm no spring chicken.


Thanks for any help in advance.

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I can't comment on the lens combination as I don't have the 18-55. Some thoughts:

 - Are you shooting photo or video? Don't think AF-A/AF-S works in video, it's either AF-C or manual focus

 - Have you tried AF-S? If AF-A doesn't work I don't think it does, but who knows

 - Have your tried spot-focus: expand flexible spot? Put the focus point over your subject and it should stay in focus really well.

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