Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art (1887)
Wilson, Edward L. (Edward Livingston), 1838-1903 · New York : E.L. Wilson · leaf 82
e one of the very best arrangements and a safe model to go by. The view given For small windows, we have the law that the illumination of a point is at the inverse rate of the square of its distance from the window. When the window is larger, the light does not decrease with the same rapidity. At… … obtain the same amount of light for a^^ as for a^, the opening in the curtain would have to be enlarged until the two angles coincide. I have met with many photographers who do not even understand these simple and easy rules, and who vainly attempt to take pictures at a^^ in the same time and with…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
