C mount
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A C mount is a type of lens mount commonly found on 16 mm movie cameras, closed-circuit television cameras, machine vision cameras and microscope phototubes.
12 mm f/1.2 C-mount lens with a C-mount–to–CS-mount adapter
Angénieux retrofocus
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The Angénieux retrofocus photographic lens is a wide-angle lens design that uses an inverted telephoto configuration. The popularity of this lens design made the name retrofocus synonymous with this t
C mount
…the design of the lens and its performance will differ considerably. For example, for the 4/3 format, a 12 mm lens is a wide-angle lens and will have a retrofocus design. For the 2/3-inch format, a 12 mm lens is "normal" and can have a simple and fast double Gauss layout. For the 1/3-inch format, a 12 mm lens is…
Nikon Nikkor-H f=2.8cm f/3.5 lens (early 1960s); note large front element, characteristic of inverted telephoto designs
Zeiss (Jena) Flektogon 4/20