I want to see reviews by photographers in their use cases. I'm qualified to speak on basketball & wildlife. I've never considered myself a birder, but I seem to have a lot of good bird shots, so maybe that too.... I'm not qualified to speak on weddings, event, astro, landscape and other stuff.
It's funny to see about the power switch, that is going to annoy me for a bit. What a strange thing to change. Maybe there were some situations in which the power switch is an issue with the R3 that I haven't experienced.
On that power switch: one of the few things I did not like about the R5 Mark I was that they moved the power switch opposite the grip. I liked to be able to turn the camera on with my gripping hand with the earlier Canon DSLRs, powering it instantly as I raised it to my eye. Moving it back to that grip side, to me, is just correcting an earlier mistake.
I just got my Mark II yesterday and was able to shoot it a bit. The switch is placed deliberately for quick powering, using the pointer finger to drag it toward the palm to its maximum setting, which gives the surest positional feedback. All good.
Jeff is THE quintessential Canon sports tog, so I thought it very notable that he preferred the R5 II over the R1 due to the resolution difference once he was able to confirm the 5-series had roughly as good AF as the 1-series. You can see his most recent comments on it at his blog in the "How did they REALLY do?" post. The two revelations here: R5 AF may not be much distinguished from the R1 ("I found that the focus was comparable to that of the R1"); and salting a gripped body with extra FPS may not be adequate to make the flagship the preferred body for Canon's most well-known sports pro.
The other thing of note is the perception of pupil focus tracking performance relative to the R3. It's been so long since I've owned an R3 that I borrowed one this week from Canon to directly compare to the R5. My thoughts:
1) The R3 pupil tracking has improved through firmware significantly since I first tried it at launch. It surprised me how much better it is now. Usable for me where it wasn't so much earlier.
2) The R5 II's pupil tracking is as good as the R3's, as was expected.
3) But, surprisingly, Jeff Cable - unlike Canon marketing - seems to indicate that the suite of AF systems is about as good between the R5 II and the R1. This is interesting. It is going to take more data. Not cancelling my R1 pre-order. I can definitively say that the AF on the R5II is much stickier than the R5 with comparable settings. This was the R5's main AF weakness in my opinion, especially with small or distant subjects.
Looking forward to finding out more re: the R5 II. It's nighthawk season here in Vermont, which is as challenging a test as any.
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