Asahi-Kogaku Takumar (M37) Lenses.

Eight preset lenses were made for ASAHIFLEX cameras. 
(All are attached to cameras using a 37mm diameter threaded mount.)
Ryohei Suzuki had created all 6 optical designs for these lenses by 1955
Standard lenses (Models I, II and III) of a 1:3.5/ 50mm and a 1:2.4 /58mm lens, were made progressively for the 5 ASAHIFLEX and 3 TOWER cameras from 1952 to 1957.
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Long focal length lenses, 1:3.5/100, 1:3.5/135, 1:1.9/83 and 1:5/500 were made in the same  period, in the order listed. No wide-angle lenses were made.

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