Phot r rear lens cap compatible with nikon is a plastic lens cap fitted for the rear of nikon lenses the rear lens cap is placed on the rear mount of your lens when the lens is not in use on your camera it protects that all important parts of your lens from scratches dust water and fingerprints rear lens coverto cover the back end of the lens after it has been removed from the camera it will keep dust dirt and debris out of the sensitive inner workings of your device while it is easi