Lummer, O. (Otto), 1860-1925, Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · London, New York, Macmillan and Co., 1900 · leaf 43
d by making a corresponding change in the position of the stop. In Fig. 4 this operation is exhibited. The full ohlicpie pencil, which fills the aperture uv of the lens S, after emergence does not meet in one point, but (so far as those rays are concerned whose meridian is the plane of the paper)… … Fig. 4. — Operation of Stop in selecting Partial Pencils and so shifting Position of Image. cause of the defect called Coma (see p. 8). Only those rays intersect each other which lie in neighbouring positions in the pencil; and they intersect more or less in a point or in a small focal line. By…
Photographic optics
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