Three-Dimensional Photography - Principles of Stereoscopy

MOUNTING, TRANSPOSITION AND SPACING 89

Fig. 5-7. Mounting errors.

C shows the result of cutting the films obliquely along the
sides. Only one image may thus be trimmed and the direction
may be either right or left, but in any event misalignment results.
D is found when one lens has a greater focal length than the
other resulting in one image larger than the other. This may not
be anticipated when using stereo cameras of reputable make.