It does take some time to calibrate the eye-control AF in many different lighting situations and camera positions, using preferably the wide eye-cup.For me the R3’s ECAF seemed more reliable than the R5II. The R1’s ECAF is more reliable for me than either the R3 or R5II.
But I think this really is a YMMV situation — I’ve read everything from it works perfectly to it doesn’t work at all.
Mine (R5 II) works now perfectly well.
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