Special Zeiss Sonnar superachromat 1:5,6/250mm lens prepared originally for the American Space Program.
Very small production, less than 50 units per year.
Delivered only for special orders. Very different optical formula compared to the normal 250mm lens, this one has a quartz fluorite element. This lens is part of a trio of truly extraordinary Hasselblad C series lenses (along with the 38mm biogon and 110mm planar), say Richard Nordin.