This lens is a Tessar formula 50/3.5 in a brass mount with "very shiny Chrome". Performance compares well with the post-war 50/3.5 coated Elmar and coated Zeiss Tessar 5cm F3.5. The I-50 is the third formulation of the 50/3.5 Tessar in the Industar series, it improves on the optics of the Industar-22 and Industar-10. The I-50 and I-22 both have similar aperture rings, both are easier to use than the Elmar.
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