Photographic optics and colour photography : including the camera, kinematograph, optical lantern, and the theory and practice of image formation (1909)
Johnson, G. Lindsay (George Lindsay), 1853-1943 · New York : D. Van Nostrand Co. · leaf 25
THE CAMERA 3 Therefore r = d\ [2] and ^ = X [3] In other words, the distance of the pinhole from the plate equals square of the radius of the pinhole, divided by the length of a light wave (0,59^, to 0,4y.). Example. — What is the correct diameter to make the pinhole for a camera 10 in. in length,… … S Fig. 2. — Diagram to illustrate the method of calculating the size of the aperture. The correct diameter of the pinhole will therefore be 0,026 in. = ^ in. (nearly) If the object be near compared with the length of the camera, another formula must be used. Let f2 be distance of the pinhole from…
Photographic optics · Color photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
