autofocus & coverage
Interestingly, Nikon DX and FX cameras use the same basic autofocus sensor modules, with only small modifications for the different formats. This means that autofocus advances happen across both formats – the D500 has essentially the same brand-new state-of-the-art autofocus system as the flagship Nikon D5. But there is a further bonus for DX Nikon users: because the sensor area is smaller, the area covered by the autofocus sensor stretches right to the edge of the frame. For sports/action photography, the D500 comes out a clear winner partly because of its autofocus system.
NIKON D500 AF
Multi-CAM 20K autofocus sensor module 153 AF points, including 99 cross-type Single-point AF, 25-, 72-, or 153-point dynamic-area AF, 3D-tracking, group-area AF, auto-area AF A side-effect of the smaller DX sensor is that the area covered by the autofocus sensor goes right to the edge of the frame