sk66
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I use a D810 and a D5/D4 currently/primarily...This is actually making me re-think my camera choice. As I've mentioned I've been considering swapping my D750 for a D810 for the cropability, but as the D810 puts more demand on the lenses and as there isn't a great deal of difference in framing between FX and 1.2x DX is minimal (the D810 at 12.x DX is 25mp, so pretty much the same as the D750 in FX) I wonder how much benefit I'll see. That being said, with both at 1.5x DX (there's surprisingly far more of a difference in framing from 1.2x -1.5x DX than FX to 1.2 xDX) the D810 is still 16mp yet the D750 drops to 10mp so maybe I will start to se more of a difference. Such a shame Nikon don't provide a try before you buy service, I'm not prepared to pay £200-300 to hire a D810 for the weekend.
*If I can use it well, I'll choose the D810. Sometimes I'll shoot in 1.5Dx mode for the increased frame rate if the images will be cropped anyway.
But there are definite negatives to it... Anytime you crop an image just about every sensor performance characteristic is heavily reduced. I.e. ISO noise increases greatly, and the D8xx is *not* great w/ high ISO at 1:1. IME, the D810 is *not* as fast/accurate w/ AF as a single digit body is, but it takes a *very* demanding situation to make it apparent. And the D8xx tends to be much more finicky in AF/AFMA in order to get the most out of it. At least with the lenses I tend to use for action/wildlife...
In reality, most of the time there is no benefit to using the D810, and even more often there is no requirement.
And then there are other limiting factors. A huge one is the lens itself... Take the 70-300, it does not matter which FF sensor it is used with, the *most* it will deliver is ~12-15MP. And irregardless of which DX sensor it is used with, the max is 8-10MP... it only goes down from there, to less than half at 300mm. A higher MP count/lack of AA filter gives an increase, but note that the larger format always generates a higher resolution.
Don't get that too twisted though... The COC requirements for "sharpness" only requires < 2MP on a FF... Personally, I think the COC requirements are not critical enough, but even if you use the most critical COC limit possible, the requirement maxes out at 12-14MP (for *any* image that is displayed at ~ 45* AOV). That's probably why DXO's lens sharpness rating chart maxes out at 12MP. What most don't realize is that most of our struggles are only in recording 12MP (usually *much less* is quite acceptable).
To give you an example, I'll use the OP's D300 w/ the 70-300 and *DXO's Perceptual MP measures. At best, at 300mm and around f/11 the system will record about 4MP. Crop that heavily to 50% and at best you'll have about 2MP... those are the kinds of actual resolutions you are seeing in the OP's example images, or even less if the image is soft for another reason (focus/SS). And when you're down here near the minimum MP limits a lens that can deliver even 1 more MP, or better yet one that will eliminate the requirement to crop, can make a big difference.
*(DXO's perceptual MP is a lens' measured MTF/resolution (LP/MM), converted to LP/sensor, converted to recorded MP's)
The highest resolution always comes from the larger (remaining) physical sensor size. A higher MP count w/in that area gives a slight increase and some other benefits, most of which are not typically needed/apparent.
In the OP's case, I believe the best answer is a lens w/ decent sharpness that will eliminate/minimize cropping (in terms of resolution/cost)... I owned a D300, IMO it wasn't bad for AF accuracy/speed. Next best is a FF body (greater recorded resolution but even more cropping), and the very best is a FF body with an even longer lens (most expensive).
Of course, the other answer is to get closer... that minimizes cropping and makes the details physically larger, which reduces the lens sharpness requirement (but it also makes moving things "faster").
In the Nikon lineup, for action/wildlife I *think the best "all around" solution is probably the D500 with the 200-500mm (or maybe a comparable 150-600). If that was the only kind of photography I did, and I could only have one camera w/ a modest budget, that's what I would be using.
(*but I haven't used them to know for certain)
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