The Nikon D750 is a mid-line full-frame DSLR. It works with all Nikon lenses made since 1977.
The Nikon D750 is a an updated Nikon D610, adding a flipping LCD — the world's first full-frame DSLR with a flippy screen — as well as the superior autofocus ability of the D810. The weakest point of the D610 is that its AF system tends to go blind and hang-up in the dark, while this D750, D810 and D4S just focus and shoot regardless of how dark it is. If you were concerned about shooting the D610 in low light, the D750 is your new camera...