Wall, E. J. (Edward John), 1860-1928 · Boston, Mass., American Photographic Publishing Co. · leaf 64
COLOR PHOTOGRAPHY 52 reflectors must be separately adjusted so that the focus of the reflected images is the same in each case, which means that the length of the optical path in glass must be equal for each plate. For this purpose, the thickness of the filters must be adjusted so that the length… … to the thickness of the two reflectors taken at an angle of 45 degrees to the axis of the lens. That is to say, it is 1. 41 times the actual thickness of the filters. The thickness of the red filter is, therefore, equal to 1.41 times the thickness of the two reflectors, while the thickness of the…
Color photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
