The Leica M500 is a generation newer than the M690 and uses different technology. This is a good choice for those surgeons that have used this model before and are accustomed to it. Features: Excellent Optical Clarity Ergonomic, Adjustable Maneuverability Dual 21V 150w lightsource Optional Video Upgrade Binocular Widefield, Inclinable Objective Lens 200mm Eyepieces 10x ;12.5x Motorized focus & Zoom