johnf3f
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- john
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I think your experience must be an isolated one.
I have used the 400 f2.8 and 500 f4 as well as other manufacturers offerings up to 800mm and would say that Nikon FF (D810/D4s for example) had absolutely fine AF but the D500 is IMO in a class of its own. Of course with the D500/D5 Nikon made some subtle changes to the actual operation of AF and it did catch some people out as it did not perform exactly as had previously been expected.
Well my experiences were at the NEC on the Nikon stand, so I had Nikon "experts" on hand in case I was doing anything wrong - which is quite possible! Anyway the first year that I tried them out they were hooked up to D4 cameras - I did get the rep to check as I was getting poor AF performance, oh dear this was just not getting anywhere near a 1D4 and 600 F4 L IS Mk1 (let alone a 300 F2.8 L IS Mk1). The next time the cameras were D4S models - better but still pretty poor, I had now upgraded to a 1DX, there was simply no comparison in the AF department. The next time the cameras were D5 models, much better - but still no cigar. Remember I am comparing these to Mk1 Canon lenses and (now) obsolete cameras. I have also used the D4/D800/D810 in the "Field" with 300 F2.8 VR and 500 F4 Vr2 lenses - not adequate AF for my needs or near to what I already have.
The Nikon system does have some definite advantages in DR etc, but my priority is AF and I have tried most systems and have found nothing to compare to Canon as far as AF is concerned. Certainly Canon is lacking in some areas - but if it ain't in focus then it is not relevant to me.
Just what I have found after trying LOTS of gear and annoying lots of Reps!