LF-1 Rear Lens Cap for all F-Mount Lenses and Teleconverters Protect your Nikon investment with genuine Nikon lens, teleconverter and camera body mount caps. Lens caps protect the front and rear portions of your lenses and teleconverters from dust, smudges and scratches. Camera body mount caps protect the mirror box and reflex mirror when a lens is not affixed to the camera body.