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Proceedings Article

An Improved Zoom Lens With External Entrance Pupil

[+] Author Affiliations
Karl M. Bystricky, Paul R. Yoder, Jr.

The Perkin-Elmer Corporation (United States)

Proc. SPIE 0039, Applications of Geometrical Optics II, 299 (March 1, 1974); doi:10.1117/12.953797
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From Conference Volume 0039

  • Applications of Geometrical Optics II
  • Warren J. Smith
  • San Diego | August 27, 1973


In order to minimize the overall length and diameter of a zoom objective system with non-trivial magnification change, when the entrance pupil must be located in front of the first element, an intermediate image should be formed, a field lens located at or near that image, and a zoom relay used to produce the focal length change. Usually such lens systems compensate image shift by moving all or part of the front element or by dividing the zoom relay into two independently moving parts. In this paper we describe an improved approach in which the tasks of focal length change and image shift compensation are shared by movements of the field lens and of the relay. This facilitates the optical design, allows the internal pupil to be favorably located, creates the possibility of fixing the exit pupil in size and position, reduces the overall size of the system, and allows a more favorable optical and mechanical design of the compensating parts. The advantages of the new concept are discussed, thin lens examples given, and potential applications to specific types of instruments suggested.

© (1974) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Karl M. Bystricky and Paul R. Yoder, Jr.
"An Improved Zoom Lens With External Entrance Pupil", Proc. SPIE 0039, Applications of Geometrical Optics II, 299 (March 1, 1974); doi:10.1117/12.953797; http://dx.doi.org/10.1117/12.953797

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