Marion and Co., author · London W. : Marion and Co., 22 and 23 Soho Square · leaf 101
89 .THE USE OF THE SWING-BACK It will be seen at once that if the ground glass were to have the position A B perpendicular to the axis E F of … the lens, the rays of light coming from the head would focus in front of it, those coming from the feet would focus behind it. If, however, we siving the ground glass so as to occupy the position C D, then both the rays from the head and the feet will come to a focus approximately upon it. This is…
Photography -- Handbooks, manuals, etc
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
