The book Photography for Students of Physics And Chemistry was written by author Derr, Louis, 1868-1923 Here you can read free online of Photography for Students of Physics And Chemistry book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Photography for Students of Physics And Chemistry a good or bad book?
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52. Focusing Cooke Lens. Taylor, Taylor & Hobson, Ltd. in the distance between the two forward glasses, a slight turn- ing of the screw alters the focal length enough to bring the image upon the ground glass with- out altering the length of the camera. When the focusing is done by adjusting the distance between the lens and the ground glass, either the front or the back of the camera must slide upon the camera bed, usually with the help of a rack and pinion movement. Cameras of the front-focus ...type have the advantage of a fixed position for the ground glass, and the operator does not have to follow it up with his head when focusing — a convenience in confined positions. They have the disadvantage that with lenses of very short focal length a part of the camera bed is likely to intrude upon the field of view unless the section is made removable. Hand cameras are of the fixed-focus or front-focus types, and the latter are usually provided with a focusing scale of object-distances and a pointer, enabling the user to dispense with the ground glass in focusing, while a tiny camera called a 'finder shows in miniature the view that is upon the plate.
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