Sony 75-300mm f/4.5-5.6 Compact Super Telephoto Zoom Lens for Sony Alpha Digital SLR Camera 75-300mm telephoto zoom lens with f/4.5-5.6 maximum aperture for Alpha digital SLR cameras Ideal for taking close-up portraits and sports action without making subject nervous Gives light sources a pleasing circular defocused effect in the background for better results Minimum focusing distance of 4 feet, 11 inches; 7 aperture blades; 55mm filter diameter Measures 2.81 inches in diameter and 4.81 inches long; weighs 1 pound, 2 ounces It is compatible with the Sony Alpha camera system (A-Mount). It is not compatible with the NEX system (E-Mount)