The Konica Hexanon AR 40mm f1.8 is a vintage lens that should be in the collection of anyone who uses vintage lenses on their mirrorless digital cameras. Fourty millimeter lenses are pretty uncommon but this lens is not hard to find and well worth the cost.
Konica Hexanon 40mm f1.8 patent: https://patents.google.com/patent/US4214815A/en%C2%A0
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