Stereophotoskop

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The Stereophotoskop is a stereo camera made by Voigtländer, from 1904 until the 1920s. It makes stereo pairs of 4×4 cm images on 4.5×10.7 cm plates, which are held in a rapid-changing magazine for twelve plates. It is a simpler forerunner of the Stereflektoskop, introduced alongside it in 1914.

The camera was redesigned twice:

• 1904 model: The first version of the camera was available with either 60 mm f/4.5 Heliar or 60 mm f/6.8 Kollinear lenses. There is no focusing. The irises of the two lenses are connected by an external metal strip so that they stop down together. The viewfinder is a non-focusing reflex finder; essentially a brilliant finder built into the body, between the lenses. There is a spirit level mounted behind this finder. There is also a folding Watson-type finder with cross-hairs, on the left side of the camera. The lens board projects beyond the end of the body on each side (McKeown describes the camera as having 'ears'.

• 1908 model: This version has focusing lenses: again either a 60 mm f/4.5 Heliar or f/6.8 Kollinear. Now both the irises and focus controls of the two lenses are connected by external metal linkages. The shutter is also improved. The shutter speed is set with a wheel (at the top of the lens board, between the lenses), and the speed setting is displayed in a window in the front of the board. On one example seen, the speed is shown only as a number 1-8; however, all other examples seen display the actual shutter speed.