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SOM Berthiot or Berthiot in short was a French optical company from about the beginning of the XXth century. SOM stood for Société d'Optique et de Mécanique, ie Optical and Mechanical Company.
Very early, it made the Périgraphe wide angle lenses for large format. These had a very slow aperture but a huge coverage and some are still in use today. After World War I it sold some cameras under their name but it is not certain if Berthiot made them or had them manufactured by someone else.
Berthiot was one of the most famous French lens makers. After the war, it competed with Angénieux in both still and cine lenses. Berthiot made a handful of lenses in Leica screw mount and Contax rangefinder mount. They are very rare and today they can fetch high prices at collectors auctions.
For the cine lens market, Berthiot launched the Pan-Cinor lenses in 1950 with variable focal length (today called zoom lenses), whereas Angénieux released its Zoom lenses in 1958. In 1960, Berthiot released the Servo-Cinor lens for 8mm cameras with a built-in selenium meter driving auto exposure.
| Advertisment for SOM Berthiot lenses, November 1942|
image by Hans Kerensky
- Cinor, Pan Cinor, Servo Cinor, Tele Cinor
- Olor 2b
- SOM Berthiot cine lenses in the 1950s and in the 1960s, at Bolex Collector
- Aquilor 125/6.2: lot no.363 of the March 25, 2006 Photographica and Film auction by Auction Team Breker
- SOM Berthiot page at Photoptic
- La SOM, Société d’Optique et de Mécanique by G. Bandelier at Le Progrès de Lyon
- Usine de verre optique F. Benoist, L. Berthiot et Cie à Sézanne by L. Grasset and G. Alves dos Santos at Patrimoine de France