Interesting observation re: new 100-500 IS

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Adam2 Veteran Member • Posts: 7,230
Interesting observation re: new 100-500 IS

My brother just purchased a new 100-500 from the latest shipment to the US and interestingly had the 1.0.7 firmware instead of the updated 1.0.9.  Not a big deal, but it seemed unusual.  Though he has an R6, I had a chance to pair it with my R5 and while I liked certain aspects about the lens compared to my 100-400 IS II (larger tripod collar, lighter weight, longer FL), the AF is seemingly less reliable - in servo ES mode my tests demonstrated focus variability in a burst of images where the first image was in focus, 2nd not, 3rd in focus, etc.  As a comparison, the 100-400 IS II AF is spot on.  The AF results with the 100-500 reminded me of using the old 7d.  Has anyone experienced this and hopefully, the new firmware will resolve this issue?

Canon EOS 7D Canon EOS R5 Canon EOS R6
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