An introduction to the science & practice of photography (1888)
Jones, Chapman · London : Iliffe & Son · leaf 124
ly in large direct portraits. The introduction of a certain obvious amount of spherical aberration, with its concomitant loss of sharpness in the picture, is sometimes desirable in order to gain what could be got no other way so well. This matter is subsequently referred to. The single landscape… … surface for correction of the aberrations, so that it is possible to get a better correction of the oblique pencils, and it also has the minor advantage that the softer flint glass is protected on both sides. The lenses of this series have maximum apertures varying from ^ to 2£. In 1886, Dallmeyer…
Photography
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