Bromide paper : instructions for contact printing and enlarging (1896)
Just, E. A · Bradford : P. Lund, Humphries · leaf 116
I lO BROMIDE PAPER. If the distance of the objedl: from the lens is decreased so that it is less than double the focal length, the sharp image must be looked for by increasing the distance between the screen and the lens. The image is an enlarged inverted one. The enlargement, together with the… … Fig. i8. By these empirical experiments we learn the relative distances at which the negative and the sensitive surface must be placed with regard to the lens, to give various degrees of enlargement or redu(5lion. On Conjugate Foci. Formula for Calculating Conjugate Foci. — The distance of the…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
