K.O.L. and Sun lenses in Leica screw mount

This is a work in progress.

The Japanese company Gojō Kōki Seisakusho began making lenses in Leica screw mount during World War II for the Nippon Leica copy. These were continued after 1945 by the company Sun Kōki until well into the 1950s.

Bibliography

• Hagiya Takeshi (萩谷剛). "Raika to sekai no raika-yō renzu" (ライカと世界のライカ用レンズ, Leica and other Leica-mount lenses). In Sekai no Raika renzu (世界のライカレンズ, Leica lenses of the world) Part 1. Tokyo: Shashinkogyo Syuppan-sha, 2003. ISBN 4-87956-061-8. Pp.178–88.
• HPR. Leica Copies. London: Classic Collection Publications, 1994. ISBN 1-874485-05-4. Pp.258–60, 263–4 and 413.

Links

In English:

• Post at photo.net reporting a Sun Telephoto 135/3.5 in direct Leica screw mount
• Sun Sola 9cm f/4, lot no.303 of auction no.16 (8 September 2002) by LP Foto

In Japanese:

• Kōgaku Seiki's Nippon camera, a page by Akiyama Michio at the Nikon Kenkyukai Tokyo website, showing a K.O.L. Xebec 5cm f/2
• Sun Sola 9cm f/4 (M39) in the camera page at Field Cameraman Note