Sankyō Kōki

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See also Sankyō Kōgaku, another Japanese lens maker.

Sankyō Kōki K.K. (三協光機㈱) was a Japanese optical company, which used the brand name Komura for a variety of lenses.

The company was already active in the early 1950s. It used the brand name Chibanon or Chibanone on enlarging lenses and camera lenses, before the use of the Komura brand. It notably supplied lenses to the Tōsei Kōki company.

Lens list

Before Komura

• Chibanon (or Chivanon) lenses for enlargement or general photography:
  • 50mm f/3.5, three or four elements, 1954–5
  • 50mm f/2.8, five elements, 1954–5
  • 75mm f/3.5, three or four elements, 1954–5
  • 80mm f/3.5, three or four elements, 1954–5
  • 80mm f/2.8, four elements, announced in 1955
  • 105mm f/3.5, manufactured on demand, 1955

Advertisement by Sankyō Kōki in Asahi Camera January 1955. (Image rights)

A Semi Frank has been observed with an E. Chibanone lens (a curious spelling variant), and Chibanon or Chibanone (チバノン) lenses are advertised on the Copenflex and Sanon Six, as well as another lens perhaps called Chibar (チバー) on the Sanon Six II.

Komura lenses

• Komura lenses in 39mm screw mount
• Komura lenses in 42mm screw mount
• Komura lenses in Exakta mount
• Komura lenses in Contax rangefinder mount

Advertisement by Sankyō Kōki in Asahi Camera November 1953. (An almost identical advertisement appeared in October 1953). (Image rights)

Other products

• Permanent cable release, 1953:
  • standard model, ¥150
  • for Leica, ¥200

Bibliography

• Asahi Camera. Advertisements by Sankyō Kōki:
  • October 1953, p.222;
  • November 1953, p.198;
  • January 1955, p.234.

Links

In Japanese:

• Pages of Terasaki Haruhisa's website:
  • Tōsei Kōki and Sankyō Kōki
  • Tōsei Kōki, with early lenses by Sankyō Kōki
• Advertisement by Sankyō Kōki dated 1954, reproduced in Shashin-Bako
• Komura 80mm f/3.5 for Leica at Kamera to Shashin to Neko to