Modern photography in theory and practice : a hand book for the amateur (1899)
Abbott, Henry G., 1858-1905 · Chicago : Geo. K. Hazlitt · leaf 228
ipO MODERN PHOTOGRAPHY into position. The film is perforated by a punch, which shows where it is to be cut off. then you are ready to develop in the dark room. The mechanism operating the lens is so constructed that you can change the speed, fast or slow, according to the light. The light coming… … fig- 4t- not strike the film in a circle as in other cameras and you can readily see that the angle of the most narrow angle lens would be so wide as to produce a blur on account of a double impression in some places. This is obviated by means of a funnel-shaped tube extending back from the lens…
Photography
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