Am I expecting too much of the AF system?

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British Jonathan Forum Member • Posts: 54
Am I expecting too much of the AF system?

I shot the following image as part of a string of images to see what I should expect from my new Sigma 35 1.4 on the A7III. It was shot at f/1.4 from a distance of only a foot or two, so the DoF is obviously going to be very very thin. You can see that it's back focused a bit, catching the hairs halfway back across her head instead of her eyes. She was walking toward me at a normal speed.

Am I hoping for too much that the AF system (on continuous, eye AF) would be able to keep up with that at such a narrow DoF?

 British Jonathan's gear list:British Jonathan's gear list
Sony a7 III Sony FE 85mm F1.8 Sony FE 16-35mm F2.8
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