Vivitar 75-205mm f/3.8 Close Focusing lens is a high-quality telephoto zoom lens. The lens is a push-pull type - thus the focal length is changed by pushing or pulling the focusing ring and the lens length is changing at the same time. It offers fast and constant maximum aperture with two-touch zoom and focus, multi-coated glass and close focusing. Its max aperture of f/3.8 remains constant at all focal lengths. Its wider aperture produces a brighter viewfinder, easier focusing and enables a faster shutter speeds in low light thus minimizing camera shake. The lens covers photographic applications from portraits at 75mm to telephoto applications at 205mm, but is recommended forsports or general outdoor photography.