ddub wrote:
Here is the picture again I have checked the store original box.
OK, enlarged, I now see what you mean. It almost looks as if this was cropped from from a larger photo and the original was shot at ISO2400 and had noise reduction applied.
I owned the Nikkor 300mm f4 (Non-stabilized) and it was an extremely sharp lens, with fabulous micro-contrast. That is what I believe is missing in this photo and could happen if shot at too high an ISO. It could also happen if the camera was shaken when the photo was taken, or if slightly out of focus.
But, after looking at the specs on your photo, I see it was shot at 800 which should present NO problem for the D500, and you should not be losing sharpness to noise reduction.
Soooo....
Looking very closely, I do not see the typical "shaken" look with faint, off axis secondary or tertiary images, so I would rule that out as well.
That leaves us only one possibility- focus.
It looks to me like there is nothing directly behind the owl (fabulous specimen, BTW) that IS actually in focus, but, the feather just in front and below the owl, and some of the brambles seem to be in better focus than our main subject (though not totally clear either).
Soooo...
I would vote for a front-focus issue, possibly combined with poor light (no sunlight on the owl).
I might even check if the same issue happens with other lenses (a camera mount mis-alignment issue) or maybe even a poorly aligned lens element.
Resolution:
My first, quick solution would be to rent another quality 300mm lens and see if the issue persists. If the shots are sharp, replace your lens. If they are still OOF, send the lens and D500 to nikon.
w