The D850 is extensively weather-sealed against dust and moisture for professional use in harsh environments, but it is not waterproof and cannot be submerged.
It provides approximately 1,840 shots per charge (CIPA standard), which is significantly higher than most mirrorless alternatives, making it ideal for full-day events.
No, the D850 records 4K UHD video using the full width of its full-frame sensor, allowing you to maintain the original field of view of your lenses.
It features dual card slots: one for high-speed XQD or CFexpress Type B cards and one for standard SD/SDHC/SDXC (UHS-II) cards.