How do I tell whether a Nikon DSLR or lens is full or cropped frame?
Let's start with some Nikon terminology. Nikon refers to their full frame cameras and lenses as “FX” and their cropped frame cameras and lenses as “DX”. The crop factor for Nikon cameras is approximately 1.5x.
Identifying an FX camera is extremely easy. Face the lens and look in the bottom right corner of the camera. If you see a yellow box with the letters “FX” in it (see example below), the camera is FX. If this box is not visible, it is a DX camera.
Identifying an FX lens is a little bit harder. Instead of looking for what is there, you have to look for what isn’t. All Nikon cropped frame lenses are marked “DX” (see example below). If a lens does NOT have this marking, the lens is an FX lens.