File:The American annual of photography (1912) (14579088410).jpg

Identifier: americanannualof1912newy (find matches)
Title: The American annual of photography
Year: 1912 (1910s)
Authors: Charles Henry Davis (1862-1929) Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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der-exposed, or the distance is over-exposed, and a perfect resultis seldom obtained—the slide is soon examined and quicklylaid aside. There is a method, however, to give actual stereo effects infar-away objects, and to so render distant scenery in a stereo-gram, that it seems to be an exquisitely made relief map, withevery hill, valley, ravine, tree-clump, etc., accurately modeled.This does not resemble nature, but is very pleasing never-theless, and one will often examine such a slide again andagain, finding new and interesting details each time. The principle is simply that of increasing the separationbetween our two lenses, when we take our view; either bysimultaneous exposure of two matched-lens cameras set up ata properly determined separation, or by two exposures of onesingle-lens camera, which has been rapidly moved a properdistance after the first exposure. The two-camera method, with two operations, is the onlytheoretically correct one, but almost as good effects can be 84
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RUTH. Charles H. Davis. produced by one operator with one camera, if a few rules befollowed—we will assume such to be the case. Our first requisite is an elevated standpoint, such as a cliffor mountain ridge—there must be some lateral space, for thetwo exposures must be made at same level and at the samedistance from the field. We want a cloudless day, or at leastno clouds over the scene, for their shadows may change placeon the landscape while the camera is being moved to thesecond position, and this mars the finished effect in thestereoscope. ELLENVILLE, N. W. FROM MT. MONGOLA.(In two separate exposures 85 feet apart.) W. C. MARLEY. The inclusion of moving objects; smoke from trains, chim-neys or bush fires; teams on roads; and the like, must beavoided. Some prominent point should be noted as a centerfor each exposure to be focused upon, and the two standpointsshould then be determined and marked—this before begin-ning exposures, that the shortest possible time may elapsebetwe

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