Bayley, Roger Child, 1869- · London : Iliffe & Sons · leaf 36
PHOTOGRAPHY MADE EASY. of the card from the lens, five inches, assuming it to be a five- inch lens we are using, F G 5 J inches and H J io\ inches respectively, we shall get two angles at A, FAG and H A J, which, if we measure, we shall find to be about 5 8° and 920 respectively.. If a five-inch… … Fig. 12. plate, therefore, we say that it includes an angle of 580. If a lens of the same focus were being used on a whole plate, it would include an angle of 920, which would be considered a very wide angle indeed. For reasons which will appear subsequently, for ordinary photography it has been…
Photography
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
