I talk about the Olympus 250mm f/2, The Olympus 350mm f/2.8, The Nikon Nikkor 300mm f/2 (and its matching teleconverter the Nikon 1.4X TC14C), the Canon EF1200mm f/5.6L and the Nikkor 500mm f/5.0 Catadioptric (Mirror) lens.