The optics of photography and photographic lenses (1904)
Taylor, J. Traill (John Traill), 1827-1895, Everitt, P. F · London ; New York : Whittaker & Co. · leaf 215
in the focal length of the objective may be secured. Subse- quently another patent was obtained for a mechanical device by which the objective may be focussed by altering the distance of separation between the front and middle lenses. In September, 1895, Mr. Hugh Lancelot Aldis, then with the firm… … fig. 81. portrait lens with a relative aperture of f-4. The inventor turned to the method of correction used by Dr. Adolf Steinheil in the Antiplanet. The front combination has strong positive spherical aberration, which is corrected by sufficient negative spherical aber- ration in the back…
Photographic optics · Photographic lenses
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