Opteka 500-1000mm f/8 High Definition Preset Telephoto Lens with Microfiber Cleaning Cloth for Olympus EVOLT E-5, E-520, E-510, E-500, E-450, E-420, E-410, E-400, E-330 and E-300 Digital SLR Cameras HD, super multicoated glass optics with anti-reflection coating for the sharper images Manual focus, digitally-optimized telephoto zoom lens Great for the wildlife or nature photographer who wants to be hidden while taking photos of the subject Gives you the equivalent of looking through a pair of 20x power binoculars 4 Elements in 4 groups