[b]300mm f/4.5 ED[/b][b] Nikkor ([i]non-Ai[/i])[/b]The 300mm f/4.5 ED-Nikkor lens was introduced in 1975, although externally almost identical to its non-ED sister model, offers a substantial improvement in optical performance for those demanding the best in telephoto photography. The 300mm f/4.5 ED Nikkor was among few other exotic class lenses, namely 600mm f/5.6 ED, 800mm f/8.0 ED and 1200mm f/11ED being the first batch of Nikkor lenses that utilized ED glass for correction of chromatic aberration, all the lenses did not a Internal focus design.