. The book of photography; practical, theoretical and applied. GuEKZ Double Anastigmat. present attained. Astigmatism is prac-tically eliminated, the other correctionsbeing also remaikably successful. Itgives high rapidity and splendid quality ofdefinition, but, as a consequence, a certainamount of depth of focus has inevitablyt i be sacrificed. The universal anastig-. Fig. .iln.—Section ok Goekz Double Anastigmat. six components of a Universal orthostig-nuit aie shown uncemented in Fig. Goerz double anastigmat, anotherjustly celebrated objective of the uni\er-sal type, is illustrated
. The book of photography; practical, theoretical and applied. GuEKZ Double Anastigmat. present attained. Astigmatism is prac-tically eliminated, the other correctionsbeing also remaikably successful. Itgives high rapidity and splendid quality ofdefinition, but, as a consequence, a certainamount of depth of focus has inevitablyt i be sacrificed. The universal anastig-. Fig. .iln.—Section ok Goekz Double Anastigmat. six components of a Universal orthostig-nuit aie shown uncemented in Fig. Goerz double anastigmat, anotherjustly celebrated objective of the uni\er-sal type, is illustrated by Figs. 514 and515. It possesses a flat field, exquisite de-finition and remarkable covering power. 368 THE BOOK OF PHOTOGRAPHY. Gkou? Lenses. traiture. Negatives produced by such lenses have the further advantage of re- For taking groups a lens is required quiring less retouching, on account • of giving flatness of field and evenness of their greater softness of definition. A definition over a fairly large angle. The large aperture is more necessary-with a.
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