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CAMERA APPLIANCES 149
Stereoscopic Cameras. — The ordinary photograph as obtained by any of the above-mentioned cameras does not, after all, give impressions which are so true to nature as those obtained by the double lens system in the stereoscopic camera.
In the pictures produced by means of these cameras the images of the near objects should be very sharply defined — in fact, as far as possible every object must stand out sharp.
No branch of photography, with the exception of the cinematograph, has in the last year or two afforded so much pleasure to the general public as the stereoscopic.
Many excellent cameras are now made which enable such photographs to be obtained with the minimum amount of trouble. Such an one is that shown in fig. 66. This can be used with films or plates, and can take either FiS 66
single pictures or stereoscopic pictures, each single picture being 3i"x3|".
Of course it is essential when viewing the two pictures that the one seen by the Right eye should be the picture obtained by the Right lens.1
A little observation will make it quite clear that if prints are made direct from the negative the right-hand one is that obtained with the left lens. Hence in order that the objects may appear in their true relative positions, the positives must be transposed, and this often is a stumblingblock for beginners.
The two views thus obtained, which at the first glance
1 Readers interested in this special branch of photography will find a detailed account in the Photographic Annual for 1910-11.