Three-Dimensional Photography - Principles of Stereoscopy

76 THREE-DIMENSIONAL PHOTOGRAPHY

rect position in space, If this plane is physically fixed by placing

in it a sheet of glass, for example, and the apparent positions of the

objects marked upon it, the result will be similar to that shown in

Fig. 5-2. CC is the Cyclopean center or the synthetic, stereoscopic

point of view.

~~

Fig. 5-2.

I I I I I I

I 'c

I---

Im

i I I I I I I I

d 1.)

'

A

.

C

-----

Fig. 5-3.

However, if we examine the ground glass of a stereo camera, or
if we make a stereo negative, we find that it has the appearance
shown in Fig. 5-3. There seems to be some similarity between Figs.
5-2 and 5-3, but they are noticeably different.
Reference to Fig. 5-4 shows the reason for the similarity and the
difference. The field of Fig. 5-4 is the same as that of Fig. 5-1 with