This adapter is purely mechanical. Any digital responsiveness your Nikon G lens may have (Auto Focus, O.I.S.) cannot be controlled from the camera with this adapter. Stop-down mode will need to be used when metering since the lens does not have the ability to have its aperture controlled by the camera body. You can shoot with manual mode or aperture priority mode. This adapter does not have correction glass inside the adapter, which will not alter the original optical quality of the lens. This Adapter allows for infinity focusing.