A:Answer The D750 and the D3300 use the same Nikon F-mount to attach the lenses. They will be interchangeable. You need to remember one main thing, if your lenses for the your D3300 are marked with a "DX" on them, when you attach them to your D750, you will see, in the viewfinder, a cropped image. The reason for that is as follows: NIKKOR DX-type lenses are made for cameras that have a smaller image sensor, like the D3300. The D750 has a "full-frame", larger image sensor, so you will be seeing, in your viewfinder on the D750, a cropped image that fits the smaller image circle of the DX lenses. For more information on this see the enclosed link: https://support.nikonusa.com/app/answers/detail/a_id/288.
