The optics of photography and photographic lenses (1904)
Taylor, J. Traill (John Traill), 1827-1895, Everitt, P. F · London ; New York : Whittaker & Co. · leaf 129
SIR HOWARD GRUB HS SYSTEM. 117 and C N will represent a pair of conjugates for that particular lens. If it be required to enlarge or diminish by four, six, or any definite number of times, it is only necessary to rock the rule on the pin till one of the distances CM is four or six times more or… … FIG. 45. other C N. In other words, a lens of any focus equal to C B will form an image of an object placed at a distance of C N at the points c M, &c. Similarly, if the focus of the lens be not known, but that the distance is known at which an image is formed behind lens of any object at a known…
Photographic optics · Photographic lenses
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