There may be a front focus issue if one or more of the batteries in front are in focus and the center battery is not as sharp. : New firmware version 1.0.5. Notice that the center battery is in focus, while the batteries in front and behind are somewhat blurred. : Help ensure your autofocus is properly aligned with a Canon Precision Alignment : New firmware version 1.1.1 is available for EOS R6 Mark II : New firmware version 1.8.1 is available for EOS R6 : New firmware version 1.0.3.1 is available for EOS-R5 C : New firmware version 1.4.1 is available for EOS R3 Since I have seen several threads with other autofocus problems, in other models of EOS cameras, I guess this is fairly pervasive, but since I actually use video fairly rarely, I can live with the fix - do it yourself focus. Disappointing, because it would be great to allow the train to approach without manually adjusting the focus, but I worked on embedded firmware for decades and understand problems can arise in corner cases. At this point I must assume that it is a firmware defect in the camera or the long lens and will have to avoid autofocus in these types of scenes in video mode due to the bright point-source lights. The lights were very small and bright and to my eye, noticeable when they went out of focus over and over. People with oscillopsia describe symptoms like these: jumping, jittery, wobbly, or shimmering vision. But the worst problem was looking at a locomotive head-on with three headlights in a triangular configuration. I have tried all sorts of combinations of Tripod with/without stabilization, autofocus long (3m/infinity vs full range), and all sorts of scenes of stationary and moving objects. I have found in the manual page 165 "Shooting conditions that make focusing difficult" item 7, "Night scenes or points of light" - well, this may be the source of the problem.
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