Ōki Kōgaku Seiki Seisaku-sho (大木光学精機製作所, i.e. "Ōki precision machinery factory") was a Japanese company based in Tokyo, Arakawa. It was the producer of two cameras during the Second World War, the Oko Six and Oko Semi. It probably made the four-element Oko or Okor lenses mounted on these cameras. It also made Hildar and Oscar lenses for the Semi Rosen U and Primo distributed by Ōsawa Shōkai.

List of cameras[]

  • Oko Six I and II (6×6 folder)
  • Oko Semi (4.5×6 folder)

List of lenses[]

  • Hildar 75/4.5 on the Semi Rosen U, also reported on an example of the Semi Lucky
  • Hildar 75/3.5 on the Semi Rosen U
  • Oscar 75/4.5 on the Primo I
  • Oscar 75/3.5 on the Primo II
  • Okor (or Oko) 75/3.5 on the Oko Six and Oko Semi

The Hildar and Oscar lenses have three elements and are probably identical. The Oko or Oko

References/External Links[]

All credit goes back to Camera Wiki Org for i do not own any of these information nor the pictures provided in this page