File:The American annual of photography (1917) (14597378200).jpg

Identifier: americanannualof1917newy (find matches)
Title: The American annual of photography
Year: 1917 (1910s)
Authors:
Subjects: Photography
Publisher: New York : Tennant and Ward
Contributing Library: Harold B. Lee Library
Digitizing Sponsor: Brigham Young University

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ion of the lenses must be i/x plus i times. Let us supposethat we are taking a near object one fourth of its natural size,then the separation of the lenses must be reduced 1/4 plus i= 1/5 and assuming that we take 65 millimetres as the normalseparation then the correct separation will be 65 — 13 = 5^millimetres. For very distant objects the separation must on the otherhand be increased to three or even four inches, but the reliefwill not be natural. This raises the whole question of the composition of thepicture and it may be taken as an axiom that there shouldalways be an object about six or at the most ten feet from thecamera. In ordinary monocular work such an object would be,as a rule, too obtrusive and take on a distorted perspective;but in stereoscopy it merely serves to throw further planesback and enhances relief and the perspective is not exag-gerated. It may also be taken as another axiom that objects beyond45 or 60 feet will practically show no relief. The latter dis- 232
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u u 4) a 3 CO < Q O H A B C 1 2 L 3 4 5 6 R 7 8 1 Z T 8 L 9 S 5 6 R 7 8 1 2 L 3 4 Figure 1.Illustrating article Stereoscopic Photography, by E. J. Wall, F.R.P.S. 233 tance varies with each observer, but the above may be ac-cepted as an average. Naturally any plate or film may be used and any developer.The one point to be observed is that the negative should befully exposed and should show no extreme contrasts. Reallya flat somewhat thin negative will give the best results. Another important point is that the negative should be sharpeverywhere. Fuzzy, soft or out-of-focus effects are not pleas-ing, in fact they are very irritating. In making the prints there are one or two points that shouldbe kept in mind. In the first place the prints must be fully \ Figure 2. exposed and somewhat flat and much too dark when examinedwithout the stereoscope. If of normal character, in nine casesout of ten the picture in the scope will appear as though every-thing was covered with snow. Sof

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