The stereoscope and stereoscopic photography (1890)
Drouin, F. (Felix) · Bradford ; London : Percy Lund, The Country Press · leaf 144
t which it can be fixed, isonly that of the two extreme positions of the lens ;it is even less because each time the camera isturned slightly the subject must be focussed to thecentre of half the plate. AND STEREOSCOPIC PHOTOGRAPHY. 137 We have, however, found it very useful forphoto-micrography… … Fig. 85. For this purpose, he uses successively thetwo halves of the surface of the lens. The lens used has half its surface covered,and it is mounted by friction, in a tube in whichit can be turned half-way round (fig. 85). A notch F to which a pin g is fixed, regulatesexactly the rotation.…
Stereoscope · Photography, Stereoscopic
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