Is Nikon D750 and Canon EF 800mm f/5,6 L IS USM compatible?

Below you will find your chosen camera and lens. Click at the product name for more information.

Nikon D750
Release date: 2014
Sensor of type FX (Full frame)
24 Megapixels (6016 x 4016 pixels)

Canon EF 800mm f/5,6 L IS USM
Release date: 2008
Lens type: Telephoto
Focal Length on 800 mm and aperture f/5,6

Can you combine this camera and lens?

No, the products cannot be combined. Here are a few reasons.