Epidiascopes (from ancient Greek επί epi "on", δία dia "through, through" and σκοπεῖν skopein "look", for example: "See-through device") are projectors that can be used both as top- light projectors ( episcopes ) and back-light projectors (here as Slide projectors) can be used. In the epidiascope shown on the left, the large upper lens is used for the episcopic projection of a template to be inserted into the device from below. The (large format) slides are inserted between the housing and the lower lens.
Hensoldt -Epidiaskop with the projection lenses Walkar and Dialyt
Historical epidiascope from Ed. Liesegang
Projection lens Diarectim of VEB Rathenower Optische Werke for a GDR epidiascope
- Kurt Tauber, Camera Museum: Leitz Großraum-Epidiaskop III S. Accessed on April 26, 2020 .