The stereo version of the No. 5 Improved Folding Kodak is one of the rarest of Kodaks.
Stereo lenses and shutters were offered as an option for the No. 5 and 6 Improved Folding Kodaks during the mid 1890's. The set cost an extra $ 32.50. The No. 5 with single lens had a price tag of $ 75. Add up the two and the stereo camera did cost a hefty $ 107.50.
The specimen in my collection is a 1894 model with a rack and pinion wheel for focusing, straight baseboard struts and a wooden lens panel without the metal brace on top.
On the baseboard are two distance scales. The one close to the front edge was used with the single lens. The one close to the body had to be used whith the stereo lenses, because the focal distance of these lenses in much shorter than the focal distance of the regular lens. So in the video you see the correct extension for this camera.