File:The American annual of photography (1917) (14803806353).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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gement without showing dis-tressing softness as a consequence. A 4x5 is about the smallestallowable. A plate camera having a rising and falling front, a ground-glass for focusing, and a swing-back to prevent distortion, isthe favorite in common use. The tripod should be as rigidas possible and equipped with rubber footguards to obviateslipping in wet weather. Finally, a rubber cover is needed asa protection against the elements. The Lens: For the average subject the lens is importantonly in determining the length of exposure. It is evident thatthe greater its speed the shorter will be the exposure. Therapid rectilinear is very suitable when used at its largest stop.The accompanying illustration (Figure i) was made with a4x5 plate camera and an R. R. lens of six inch focus andworking at F/ii. Flare is caused by light entering the lens from one sideand reflecting in to the plate. This can be prevented by theuse of a lens hood. Plates and Film: The question of whether to use plates or 40
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Rudolf Eickemeyer. film is optional with the photographer. Many workers con-sider films, because of their orthochromatic and non-halationqualities, far superior to plates. But they are not to be de-pended upon for the latter characteristic when powerful arc-lights come into the picture. Too much stress should not belaid upon the prevention of halation as a certain amount ofit is necessary to obtain a natural effect. It is expedient touse an orthochromatic plate of as great speed as possible andcoated, not backed, with an halation preventive. This last isimportant, as the ordinary backed plate with its glass sidecoated with a soluble preparation is not much better than nodeterrent at all. Halation is caused by light passing throughthe film, striking the glass and reflecting back to the film, andit is evident that the preventive should come between theemulsion and the glass so as to intercept the light. Subjects—Street Scenes: The city photographer will selectthis class of night work

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