Takumar 58mm f/2.4

Notes and sources

Documented from the original Asahiflex Model II manufacturer manual, Takumar interchangeable-lens section. These are the M37 configurations, not later M42 lenses. The manual gives element counts without group counts; missing filter sizes, dimensions and exact production dates have not been inferred. Maker distance scale starts at 2ft; the metric minimum is a rounded conversion. The primary manual specifies f/22 and 200g for this M37 preset lens.