Rack and pinion focusing - mechanical focusing system used on copying or monorail cameras. A pinion engages a rack on a slide. Focusing is achieved by turning a knob or wheel, which moves the lens or image panel.
The "Reisekamera" characteristics of this variant are a similar portability, rack and pinion focusing aid, and similar image formats and extendibility of bellows.
The smaller sizes carried a rack and pinion focusing movement, and you had to pay extra for an iris diaphragm instead of Waterhouse stops. Ross also made lenses of this type in f3.5 aperture. ...
 See also: Plate, View camera, Development, Flat, Focal length
  
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