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Lena Kōgaku (レナー光学) was perhaps a Japanese lens maker in the mid-1950s. The marking Lena–Kogaku Tokyo appears on the Lena-Q.C 5cm f/3.5 collapsible lens mounted on the Chiyoca Leica copy made by Reise. An identical lens called Reise-Q.C and engraved Reise–Kogaku Tokyo is found on other examples of the Chiyoca. "Lena Kogaku" might be a mere dummy name used by Reise: see the discussion and the description of the lenses in the page on the Chiyoca and Chiyotax.