An introduction to the science & practice of photography (1891)
Jones, H. Chapman (Henry Chapman), 1854- · London : Iliffe & Son · leaf 135
use they possessed the desired property ; but in such cases the effect is due to carelessness, it is uncertain in amount, and cannot be regulated. Dallmeyer gave the possibility of getting a certain and regulatable amount that might be reproduced exactly at any time. The advantages of the… … Fig. 32. out by J. Petzval in 1859, that is, by a mathematician who was neither optician nor photographer. Indeed, he gave directions for getting a certain amount of spherical aberration with his orthoscopic lens.
Photography
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