AlanF said:Collected the 5D IV this morning. It's a pain just having DP 4.5 as the only available software. What I can say at this stage is that the focus with the 400 DO II + 2xTC is very snappy and consistent. There is an increase in resolution on going from 400 -> 560 -> 800mm by about what is expected, whereas the 5DS R maxes out at 560mm. But, the 5DS R at 560mm looks sharper than the 5D IV at 800mm. For static photos, the 5DS R will beat out the 5D IV for "reach". As mooted by Arash in the fredmiranda thread, AF is significantly better with the 5D IV and it is faster, which will be better for birds in flight, and the 1DX II is better still. But, Arash is a BIF specialist and I am more of a sitting duck shooter.
Alan, thanks for this. Is the camera on loan or are you serious about buying it?
From what Ari is saying the trade off is essentially this. The snappiest AF that to him is acceptable with 2X is with the 1DX II and the 1D4 doesn't cut it. For you and I we are not as dedicated to BIF and so that assessment may not be valid.
Since you have the 5D4 in your hands I guess with a little time you can assess that. Is the 30 MPs with poorer AF a good trade off or are we going to also lose relative to the 1DX II larger pixels and better IQ, albeit at 20 MPs?
I know first hand that my 6D competed quite well with my friends 1DX for IQ when cropping, so that's always in the back of my mind when I think of the 1DX II with only 20 MPs.
Jack
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