Nikon Nikkor T* ED 1200 + 600mm Lens in Copal 3 Shutter for 600,800,1200mm System
https://www.nikon.it/it_IT/product/discontinued/nikkor-lenses/2007/1200mm-f-18-0-t-large-format-t-series-lens#tech_specs
http://homepages.tig.com.au/~cbird/nikkor/t.html