Photographic optics and colour photography [electronic resource] : including the camera, kinematograph, optical lantern, and the theory and practice of image formation (1909)
Johnson, G. Lindsay (George Lindsay), 1853-, Parsons, John Herbert, Sir, 1868-1957, donor, University College, London. Library Services · London : Ward & Co. · leaf 64
S 1 § 19. Examination of a Simple Piano = Convex Lens or BulFs=eye. — In studying and testing photographic lenses, it is just as well that the student should make himself familiar with a simple lens. If a plano-convex spectacle lens of short focal length (Fig. 40a) be fitted to a camera, with the… … Fig. 40a. — Diagram showing the formation of Fig. 40b. — Halo spherical aberration by a plano-convex lens. at F. the field, the image being surrounded by a halo or aureola at F (represented by a dotted circle in Fig. 40b). This is due to spherical aberration, and the diameter of the disc or halo is…
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