An introduction to the science & practice of photography (1895)
Jones, Henry Chapman, 1854- · London, Iliffe, Sons & Sturmey Ltd · leaf 134
. 34. The maker claimed for it that it avoided distortion of the image, and that it was more rapid in action and gave more depth of focus than the original Petzval. However, in spite of this improbable combination of improvements, this construction was soon abandoned. The greatest departure from… … Fig. 35. are shown in figs. 35 and 36. In both cases the anterior combination has a shorter focal length than the whole lens, and the posterior combination is diverging. The back and front combinations both suffer greatly from spherical and Fig. 36. chromatic aberrations, but to an equal extent in…
Photography
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