An introduction to the science & practice of photography (1895)
Jones, Henry Chapman, 1854- · London, Iliffe, Sons & Sturmey Ltd · leaf 130
cluded this form of lens could be made as rapid as the ordinary portrait lens. J. H. Dallmeyer considered, and the firm still consider, that this pattern is not the best for general portraiture. Voigtlander, however, has since then introduced two series of rapid symmetrical doublets, his… … Fig. 31. At the same time that J. H. Dallmeyer obtained a patent for his wide-angle rectilinear lens, 1866, he got pro- tection for a modification of the Petzval portrait lens, in which the flint component of the separated back combina- tion was put behind instead of in front of the crown, and the…
Photography
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