STEREOSCOPIC PHOTOGRAPHY 



591 



Full technical information is obtainable in the Journal of the Optical Society of 

 America, vol. 21, pp. 109-118; or Bell Telephone System, Techjiical Publications, 

 Monograph B-550. 



Distortions and Aberrations. — Any change in shape of a stereoscopic image from 

 the original scene should be classified as a distortion. For purposes of convenience 

 changes in size have also been included in the following discussion. Certain of the 



Table II. — Distortions and Aberrations in Stereophotography 

 Distortions in Stereoscopic Images 



Subscripts: S refers to stereoscope; C refers to camera. 



/ = focal length; 



d = distance of plate from lenses; 

 M = magnification of lenses; 



B = distance between optical centers of lenses; 



e = interocular distance. 



elements causing these have been discussed on page 573 under Location and Size of 

 Images and on page 588 under Hyperstereoscopy. These will not be discussed again 

 here. 



Other distortions arise from many causes when the conditions for orthostereoscopy 

 are not fulfilled. As the actual image formation is a composite of a number of vari- 

 ables, the distortions listed in Table II and the subsequent discussion are the tendencies 

 setup by the conditions which cause them. These must be weighted against the other 

 factors present. 



