The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular (1877)

Record Details:

Title:
The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular
Date:
1877
Publisher:
Philadelphia, J. A. Moore
Volume:
The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular
Leaf #:
00023
Language:
English
Collection:
Books
Format:
Books
Contributor:
University of California Libraries
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Date Added:
July 19, 2022
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14 SCIOPTICON MANUAL. emerging from it. As the result of these refractions they meet at /. The converging power of lenses, of uniform substance and density, is in proportion to their Fig. 4. degree of convexity. For a lens to sharpen the image, the screen must be adjusted to the focal distance. STOPS. To get on the same plate something like distinct images of objects at various distances, a " stop " is used by the photographer, which, though it necessitates long exposure, secures " depth of focus." This expedient of having a small aperture is also resorted to for lessening the defects or aberrations of lenses, just as the aperture b (Fig. 3) is made small to lessen the greater defect of having no lens. Stops are not used in the Sciopticon objective, because all portions of the picture-slide are in the same plane, and because sharpness produced by stops is always at the expense of light. CHAPTEE II. THE CORRECTIONS REQUIRED BT I.EXSES. The corrections required by lenses (as well as every- thing photographic), is well set forth in Dr. Yogel's Handbook of Photography. The use of such diagrams, as are here appropriated, is kindly allowed by the Ameri-