An introduction to the science & practice of photography (1888)
Jones, Chapman · London : Iliffe & Son · leaf 134
130 [the science and practice of photography. 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 … Fig. 36. spherical and chromatic aberrations, but to an equal extent in an opposite sense, so that they form a properly corrected whole. It is claimed by the inventor that by means of this principle a better definition is secured at the edges of the field. The maximum aperture of the portrait lens…
Photography
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