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C4 Modified Lenses
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LEFT: Unmodified Argus C4 with the standard 50 mm Argus Cintar f/2.8 lens.
RIGHT: Modified Argus C4 with Lithagon 35mm f/3.5 lens.  Knob and latch shown to the right of the lens indicates a C4 has been modified for Lithagon lenses.  Modified C4s could also accept modified Cintar 50mm lenses in addition to the Lithagon lenses shown below.
45 mm, Lithagon standard Lens, f/1.9
Very fast, very sharp, very rare! 
35 mm, Lithagon, f/4.5
100 mm, Lithagon, f4.5

135mm, Lithagon, f/3.5
Note unique see-through lens shade