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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 51, Iss. 12 — Dec. 1, 1961
  • pp: 1422–1423

Grainless Screens for Projection Microscopy

I. LEIFER, C. J. D. SPENCER, W. T. WELFORD, and C. N. RICHMOND  »View Author Affiliations

JOSA, Vol. 51, Issue 12, pp. 1422-1423 (1961)

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Back-projection screens for projection microscopy with high luminance and no loss of definition are described; the screen grain is removed by the slow relative movement of two ground-glass screens placed face to face.

I. LEIFER, C. J. D. SPENCER, W. T. WELFORD, and C. N. RICHMOND, "Grainless Screens for Projection Microscopy," J. Opt. Soc. Am. 51, 1422-1423 (1961)

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  1. This source has a luminance of 20 000 stilbs and the theoretical screen luminance under the conditions of use described above is 0.006 stilb; the difference may reasonably be ascribed to reflection and absorption losses and to the difficulty of completely filling the condenscr aperture with the image of the part of the source of maximum luminance.
  2. S. Hecht, J. gen. Physiol. 7, 235 (1924).
  3. S. Hecht, Arch. Opthalmol. 57, 564 (1928).
  4. F. A. MacAdam and Taylor, Taylor & Hobson Limited, British patent 592,815 (1947). See also K. J. Habell and A. Cox, Engineering Optics (Pitman Publishing Corporation, New York, 1948), p. 273.
  5. J. Dyson, J. Opt. Soc. Am. 50, 519 (1960).
  6. N. H. Mason, British Patent 590,981 (1947). See also E. Lau and J. Reinitz: "Optik aller Wellenlängen" p. 229 (Berlin, 1959) and E. Lau and R. Schalge, Feingerätetechnik 7, 121 (1958).

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