Which objective lens deliver the highest amount of light? - Quora
Grays of Westminster - This is the 1200-1700mm f/5.6-8P IF-ED Zoom-Nikkor AIS and it is Nikon's largest ever zoom lens. Shown here outside of Grays of Westminster. The cost of the lens
Nikon ED Nikkor 1200-1700mm f/5.6-8 P IF lens report from the PCH Pro Shop - Nikon Rumors