I can remember only 2 instances: the RF70-200 consistent mis-focus issue and the EF600 shutter-shock issue. I'm still surprised Canon released the 70-200 as it was, you'd think QA would flag a consistent mis-focus on every copy.I have the sense canon is not a company that will bend to complaints until it is a very high percentage of us upset about something. Some people might say there was a lot of complaints about the R5's 8k video and then they improved it with the firmware and then offered the R5c, but I'm not convinced that they weren't planning on those two things already.
That also showed that the open-loop nature of the current DPAF algorithms can remove the 'focus' bit from AF :/
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