Three-Dimensional Photography - Principles of Stereoscopy

CORRELATION OF CAMERA AND VIEWER 69

repeat the details in each instance. Figures 4-7 and 4-8 show the

significant ray paths for this condition, while the graphic diagram

is shown in Fig. 4-9. Incidentally, Fig. 4-9 is the complete draw-

ing for the condition used in the key plate, Fig. 4-5. Longitudinal

distances appear to be lessened and solid objects are thinner in

depth, tending toward the “silhouette” form.

Variations in Base.-When variations in base are considered,

the matter becomes more puzzling because we have complications

arising from subjective interpretation to confuse the stereoscopic

reproduction.

Naturally, unless we use some kind of special reflector eyepiece,

the viewer interocular must conform more or less closely to the

anatomical interocular, so these variations of base will be assumed

to apply to the camera, being either greater or less than the

normal.

6

R

\

f

Fig. 4-10. Camera base
less than normal.

Fig. 4-11. Viewing stereogram

made with camera base less than

normal.