This is a high performance super telephoto lens utilizing artificial crystal fluorite and UD glass lens elements in the optical system. Despite the large aperture, the lens has sharp image quality throughout the entire frame even when aperture is at its maximum, in addition to excellent operability due to the rear focusing system that does not change the overall length of the lens, the vari-pitch focusing system that makes focusing easier at long distances, a one-touch revolving mechanism, and a prefocusing mechanism.