Canon FD 200mm f/4 Lens FD

  "Unusual new features in this New Series FD Lens include Rear Group Focusing System (to facilitate compactness), reduced weight and size, improved optical formula to reduce chromatic aberrations and a closer minimum focusing distance and smaller minimum aperture for greater flexibility of operation. Mounting has been considerably improved using the new bayonet technique. Because of the exceptional balance and light weight of this new lens, it can be hand-held with great ease. It is an outstanding lens for any SLR system because of its combination of telephoto impact and easy portability."