Stéréocycle by Bazin & Leroy

The Stéréocycle was introduced by Bazin & Leroy in 1897. The name “Stéréocycle” is based on its clever design that uses rotation cycles to load new plates. The two 6×6,5cm glass plate negatives that make a stereo pair are placed in separate metal frames. After each exposure the cover of the magazine is loosened and the camera is rotated clockwise twice (with the lenses down). This places two unexposed plates in shooting position. Each rotation moves a plate from the back of the left stack to the back of the right and a plate from the front of the right stack to the front of the left stack.

The magazine with 24 plates in two uneven stacks
allowing shifting of plates while rotating the camera

On 6 February 1903, Lucien Leroy presented at the Société Française de Photographie the Stéréocycle à décentrement with lens offset. This model could shift the lenses vertically to photograph high buildings and correct vertical converging lines[1-p.12].

The lenses:
The camera is offered with lenses from different manufactures in a catalog from 1913[2]:

  • Ross 80mm F7.7
  • Berthiot 75mm F6
  • Goerz serie III 75mm F6.8
  • Tessar-Zeiss 75mm F6.3

This Stéréocycle is an early model with serial number 4906. The camera has two Koch Anastigmat lenses without serial numbers. The focal length is not specified, but is probably 75mm or 80mm. The diaphragm must be set for each lens separately. The shutter is in working condition and supports five different speeds. Changing the plates by rotating the camera works flawless.

Stéréocycle by Bazin & Leroy
The back of the camera

The camera’s features:

  • Support for 6 x 13cm stereoscopic format, produced by two paired glass plate negatives of 6 x 6,5cm
  • Magazine for 24 glass plates (producing 12 stereoscopic images)
  • Two fixed focussing Koch Anastigmat lenses with four diaphragm settings, numbered 1 to 4
  • Five shutter speeds which can be set using a selector: 1 = 1/10 sec., 2 = 1/25 sec., 3 = 1/45 sec., 4 = 1/60 sec., 5 = 1/75 sec. and “pose” (manual)
  • Full metal body of about 1000 grams
  • Folding crosshair viewfinder


  1. Les fondamentaux du Club Nièpce Lumière. De Londe à Guérin ou l’histoire de la maison Dessoudeix, Autumn 2011
  2. Catalog Lucien Leroy, 1913
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