Kipon Canon EF Mount Lens to F3 Camera Body Mount Adapter allows you to attach Canon EF Mount Lens to a F3 Mount Camera Body. This adapter gives you the advantage to still be able to share your lenses between cameras without having to spend more on a whole new lens. Certain lenses cannot be replaced and maybe you like the look of a certain lens but want to be able to use it on another type of camera body. Now You Can! Although the lens will fit physically, automatic diaphragm, auto-focusing, or any other functions will not operate correctly while using 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.