If you’re using a Nikon G-series lens, this is not the correct adapter for you. You need the Canon camera to Nikon G lens adapter.
This adapter is for those adventuresome souls who would like to shoot Zeiss ZF or other Nikon D-series lenses on their Canon cameras. The Fotodiox Pro adapter mounts to any standard Nikon lens which then can be mounted on your Canon EOS camera. Using this adapter means shooting full manual: manual focus, manual shutter speed, and manual aperture control. If you’re not comfortable with that, this isn’t the right toy to play with today.
This adapter provides no electronic communication between the camera and lens. All aperture and focus adjustments must be made manually on the lens itself. The aperture selected will not be displayed on the camera, and it will not show up in the EXIF data.