The Nikon Nikkor T ED 800mm f/12 is an ultra-long telephoto-design large format lens with a 310mm image circle, covering 8x10in with minimal movements. At 1600g with a 95mm filter thread, the telephoto design keeps the back focus practical. The ED glass provides critical chromatic correction at this extreme focal length. It is one of the longest large format lenses available, designed for specialised long-distance photography on 4x5in and 8x10in formats.