A condensed course in motion picture photography ([1920])

Record Details:

Title:
A condensed course in motion picture photography
Date:
[1920]
Author:
New York Institute of Photography
Publisher:
New York, New York Inst. of Photography
Volume:
A condensed course in motion picture photography
Leaf #:
00062
Language:
English
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
14
Date Added:
July 19, 2022
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THE NATURE OF LIGHT This image is always reversed and inverted; that is, like a mirror reflection turned upside down. By again referring to Fig. 14 we see the reason for this. All of the light rays emanating from A on the tree which strike the lens are condensed and brought to a focus at the point a in the image. Likewise, Fig. 15. Indistinct image caused by overlapping circles of confusion. all of the rays which strike the lens from the point B are focused at the point b in the image; in a like manner all of the other points on the surface of the tree are delineated on the screen without rendering the diagram too complicated by trying to reproduce the path of the light rays from all of the other points on the tree. If we move the screen a small distance in either Fig. 16. Double inversion by means of two lenses. direction from the focal plane the image becomes blurred and indistinct, since our points of illumination then become overlapping circles of confusion, as in Fig. 15. The image ab in Fig. 14 is termed a real image, because it may be focused upon a screen and to distinguish it from certain other images which we will consider later, which can be seen but which cannot be focused upon a screen and which are termed virtual images. This image may 43