in addition to this Version 1.5.1, we are in the process of developing an update to further optimize AF operations. We plan to publish details of the revised firmware in late March and will make an announcement on the Web site.
i have both d810 d850 d4s canon r5 etc D850 is much better at focusing then d810 so is d4s. Just buy a card reader instead of directly to computer . Unless you want to tether in a studio setting. do you have nikon raw codec installed on computer?
Nikon | Download center | NEF Codec