| 摘要 |
The present invention relates to a stereoscopic viewer which comprises optical elements permitting simultaneous examination, through two eyepieces, of two successive panoramic images in a film of panoramic exposures, the elements defining an optical path between each of the two images and its relevant eyepiece, and control elements for displacing one of the two images received by the observer in relation to the other; the optical elements comprise, for each optical path, on the one hand, a set of mirrors providing an odd number of reflections and, on the other hand, a total-reflection prism, preferably a right prism, the two prisms having, as a base, an isosceles triangle; the faces of the two prisms corresponding to the third side of the base, upon which total reflection is effected, are arranged substantially perpendicularly to the plane of the film to be examined and form between them an angle of about 90 DEG , one of the faces running substantially parallel with the longitudinal axis of the film to be examined.
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