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EOS R6 - AF not on target on few pictures

Started Sep 11, 2021 | Discussions thread
OP Chris_From_Holland Junior Member • Posts: 49
Re: EOS R6 - AF not on target on few pictures

Karl_Guttag wrote:

It might help to post a few pictures (preferably full-frame and resolution). Sometimes people think they have one problem when it turns out to be something different. Without a picture is it hard to know

Were you using the shutter button half-press focusing or using the back button focus? Sounds like half-press but just wanted to check.

Any chance the camera moving between focus locking and the shot? Not saying you did but it seems strange the focus lock point was not in focus.

Chris_From_Holland wrote:

Hello,

I'm going through my yesterday concert shots, and I have a bunch of pictures where the AF seems to be way off.

As the lighting was limited and very red (hence high ISO), I'm wondering whether it's simply me hitting the limit of the AF tracking, or if I have to worry further.

EOS R6 + Canon RF 70-200 f/2.8 (Raw only)

Camera set in Fv mode, shutter 1/200, Aperture f/2.8, ISO 8000

AF mode : Face/Eye detection + tracking (priority People)

Servo AF Mode 4 (sensitivity -1, accel +1)

The AF-Point is set on the face (eyes were not detected) and confirmed locked on the face (DPP confirms the red square), but the face is not sharp while the cymbal ~1m in front of the drummer in crisp sharp.

I have this problem on few pictures, and the AF is again spot on the next pictures (face sharp, cymbal not).

I'd lean towards a case of bad luck, but I kindda need to understand to avoid same problem next time

Thanks!

Chris

I can make the raw available on demand, but not widely, as I don't want to breach privacy,
I was indeed using the Back-Button focus, and it might have been moving unknowingly. What puzzles me is the fact that the AF is reported locked

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