The Hanimex Tele-Auto 1:3.5 f=135mm lens is a manual focus telephoto lens designed for photography enthusiasts. Focal length of 135 mm. Please note this Hanimex Tele-Auto 135mm f/3.5 lens (Serial No. H656579) is approximately 50 to 55 years old, manufactured around the late 1960s to early 1970s. Looking at it, it looks fine but no way to test it