Journal of the Society of Motion Picture Engineers (1930-1949)

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98 KAPRELIAN July aperture of the microscope objective. Projection means utilizing a projection test slide may also be employed for testing these objectives, provided the projector condenser is of an aperture capable of filling the objective with light. For those photographic applications where even the great lightgathering power of an extreme-aperture objective is insufficient or where the speed of such an objective must be maintained while enjoying the greater depth of focus, higher contrast and higher resolving power of an objective of more modest aperture, an electronic stage such as an image tube or an image orthicon, or other intermediate means such as phosphors, provide the next obvious step for increasing the amount of energy in the image. REFERENCES (1) R. Kingslake, "The design of wide aperture photographic objectives," /. Appl Phys., vol. 11, pp. 56-69; January, 1940. (2) W. Taylor and H. W. Lee, "The development of the photographic objective, Proc. Phys. Soc. (London), vol. 47, pp. 502-519; January, 1935. (3) H. W. Lee, "New lens systems," Phys. Soc. (London), Reports on Progress in Physics, vol. 1, pp. 130-149; 1940. (4) R. Kingslake, "Optical glass from the viewpoint of the lens designer," J. Amer. Ceramic Soc., vol. 27, 189-195; June, 1944. (5) W. Merte, "Das Photographische Objektiv Seit dem Jahre 1929," Erganzungswerk I, Handbuch der Wissenschaftlichen und Angewandten Photographic, vol. 1, pp. 1-98, Springer, Berlin, 1943. (6) K. Leistner, "Photographische Optik," Fortschritte der Photographic II, Akademische Verlagsgesellschaft, Leipzig, 1940, pp. 27-73. (7) K. Leistner, "Photographische Optik," Fortschritte der Photographic III, Akademische Verlagsgesellschaft, Leipzig, 1949, pp. 291-302. (8) W. Merte, U. S. Patent 1,967,836 (1934). (9) A. Warmisham, British Patent 485,096 (1938). (10) A. Cox and H. W. Martin, "The assessment of lenses," J. Sci. Instr., vol. 22, pp. 5-12; January, 1945. (11) E. Kaprelian, U. S. Patent 2,424,827 (1947). (12) E. Leitz, Deutsches Reich Gebrauchmuster, 1,285,900 (German petty patent, about 1932). (13) C. Zeiss, French Patent 884,478 (1943). (14) M. Herzberger, U. S. Patent 2,186,605 (1940). (15) B. E. Luboshez, U. S. Patent 1,910,115 (1933). (16) B. E. Luboshez, U. S. Patent 1,952,268 (1934). (17) W. Bielicke, U. S. Patent 1,839,011 (1931). (18) H. W. Lee, U. S. Patent 2,012,822 (1935). (19) H. W. Lee, British Patent 419,552 (1934). (20) L. Bertele, German Patent 441,594 (1925). (21) P. Rudolph, U. S. Patent 1,833,593 (1931). (22) A. Warmisham, U. S. Patent 1,926,569 (1933).