Canon adds focus breathing correction support to f/2.8 and f/4 RF zoom lenses via firmware

No, SA adjustment is a feature, focus shift is an issue . And if Canon can correct focus breathing, they sure could correct via firmware focus shift.

The EF version of the 100mm IS macro had focus shift, it just wasn’t as obvious. I don’t believe focus shift can be corrected in firmware. Canon has in the past evolved lenses to reduce the effect, the EF 50mm f/1.2L being an example.

I don’t recall ever seeing a firmware update that corrected focus shift. It’s 2022 though, maybe it’s in the works.

Most, if not all fast lenses have focus shift to some degree.

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