alx wrote:
I have the Vello BG-N19-2 grip for my D850 and it works will with all controls integrating the way they should. Note that for the speed increase, you WILL need the EN-EL18b type battery, BL-5 chamber cover and a charger, the same as the Nikon grip will need. The battery supplies the extra power for 8fps, not just doubling up with dual EL15's.
Doubling up the batteries does not increase the power...uses one battery at a time. Plus you need the 18C and not the 18B and its special charger to achieve the theoretical 8fps. Note the previous post.