Abstract
PROF. STEINHAUSER, of Vienna, has recently pointed out that there exists a determinate relation, between the size and relative position of the two views of a stereoscopic picture, the lenses of the camera with which it is taken, and the optical arrangements of the stereoscope in which it is to be viewed. If these relations are observed rightly, the effect of relief will be much more perfectly attained for all parts of the picture than if they are neglected. The eye-pieces of the stereoscope above the plane of the photographic pictures ought to be made as nearly as may be equal to the focal length of the objective of the photo grapher's camera, and this again should be about equal to the mean distance of easy vision, or, from ten to twelve inches. Herr Steinhauser, after developing the theory of the instrument in relation to this point, throws out three very definite and simple suggestions for the photographers. Firstly, that all stereoscopic pictures should.be taken with lenses of equal focal length, say 15 centimetres; secondly, that all should be made of equal breadth, or about 75 millimetres; thirdly, that the distances between the centres of the objective-lenses should always be kept constant.
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Physical Notes . Nature 21, 117–118 (1879). https://doi.org/10.1038/021117b0
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DOI: https://doi.org/10.1038/021117b0