An introduction to the science & practice of photography (1895)
Jones, Henry Chapman, 1854- · London, Iliffe, Sons & Sturmey Ltd · leaf 125
ristened their productions variously as orthoscopic, orthographic, calo- scopic, etc. Fig. 23 shows the lens as made by the American Fig. 23. optician, Harrison. It will be observed that Petzval has adhered to his first principle of a separated back combination, but in this case the combination is… … Fig 24. pronounced it not so useful to them as the single landscape lens, and found that it required a smaller stop. The ortho- scopic lens gives pin-cushion distortion, but to only a slight extent as compared with the opposite, barrel-shaped distor- tion of single lenses with the diaphragm in the…
Photography
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