The nikon 500mm f4 vr prime is the worlds lightest super telephoto lens compatible with both fx and dx format digital slrs featuring an improved vibration reduction vr image stabilisation system with an effect equivalent to 40 stops plus two fluorite lens elements to keep the weight down and better af tracking for continuous shooting of moving subjects this lightweight robust lens is quicker more versatile and almost 800g lighter than its predecessor a new electromagnetic diaphragm me