Tamron lenses from the Adaptall era (late 1970s) but with fixed mount instead of interchangeable (hence "F" in the lens name). Focusing and aperture rings are clad in slip-proof rubber material - easy to find, yet nearly impossible to confuse even when your camera's at eye-level. Each telephoto and zoom lens incorporates a built-in lens hood that's loss-proof and always ready to help prevent image-degrading flare. Each lens offers extra-close focusing without cumbersome accessories or attachments. All lenses are precision-coated to optimize image contrast and light transmission at every aperture.