I have been shooting the D500 since it was released mainly because I have a collection of DX lenses left over from earlier D7000 and D90 and simply the cost. I mainly shoot Fisheye's and I am of the opinion that DX camera perform better than FX in this instance especially when you use the Nikon 10.5mm. The D500 ticks all the boxes which I want it to do at a price which much lower than the FX range.
I use the following on my D500:
I went with the Tokina 100mm as I dont shoot much macro and the Tokina 100mm is a great lens and is half the price of the Nikon 105mm. It does the job for me.
Regarding the battery life of the D500, once changed to the newer nikon battery EN-EL15 Li-ion 20 and turning the camera onto flight mode I was able to get well over 1200 shots for stills. If video was used ther battery life is reduced greatly but I think that is the same for the D850. The D500 has excellent video and custom WB of the fly is great.
I can't comment on the D850 as I have never used one but at the end of the day I think it comes down to you sitting down with your budget and seeing what the best bang for buck. Going for a housing which is made of clear plastic isnt one of them either.
- vigfus likes this