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The definitive equipment listing for Prakticas on the internet
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 Lenses -> M42 -> Carl Zeiss Jena Biotar 2/58
   
Construction - 6 elements, 4 groups
Angular field - 41°
Minimum focusing distance - 0.5m
Diaphragm action - Manual/Pre-set manual
Minimum aperture - f/16
Filter size - 49mm screw-in type
Weight - 210g
Lens size - 60X46mm
Description - The original lens for the Contax S, in both black and bright aluminium barrel, minimum aperture as f/22 and minimum focussing distance 0.9m. Later more common version finished in bright aluminium barrel with pre-set manual diaphragm.
 
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