The Vivitar 75-205mm f/3.8 MC Macro Focusing Zoom Lens is a manual focus zoom lens with an Olympus OM mount. It has a maximum aperture of f/3.8 and a focal length range of 75-205mm. The lens is made of aluminum and has a compatible lens front and filter size of 62mm. Used!!! Inside looks clean and has no scratches! Please see photos on condition and ask questions!