In case you are thinking to upgrade your current full frame Nikon DSLR camera to the upcoming D850, here are the numbers I got from Adorama trade-in department on how much they can pay for your existing Nikon DSLR camera: •Nikon D810 up to $1350 •Nikon D800 up to $850 •Nikon D800E up to $1000 •Nikon D750 up to $950