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Proceedings Paper

Design of a twenty-element long focal length zoom lens
Author(s): Robert M. Malone; Brent C. Frogget; David A. Grafton; Frank R. Mitchell
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Paper Abstract

An optical lens system with varying magnification has been designed for a 70-mm image format. Twenty optical elements were needed to provide for the 345- to 1050-mm focal length zoom range as well as the proper color correction over the visible spectrum. A 4-in diameter port window limits thef/# of the optical lens system. Operation of the lens system is done by actuating stepping motors through a MacPlus computer. This lens system was designed for Los Alamos National Laboratory Group M-8, because no commercial zoom lens existed that would change its reduction from 1/15 to 1/4 at a focusing range of 5 meters. Additionally, we required a larger, non-standard image size that could be recorded by a rotating mirror streak camera. A Nikkor lens sales manual does offer a long focal length, 35-nun lens only upon special order. The closest focusing range of this Nikkor lens is 6 meters.

Paper Details

Date Published: 1 November 1990
PDF: 6 pages
Proc. SPIE 1334, Current Developments in Optical Engineering IV, (1 November 1990); doi: 10.1117/12.22834
Show Author Affiliations
Robert M. Malone, EG&G, Inc. (United States)
Brent C. Frogget, EG&G, Inc. (United States)
David A. Grafton, Consultant (United States)
Frank R. Mitchell, Frank R. Mitchell & Associates (United States)

Published in SPIE Proceedings Vol. 1334:
Current Developments in Optical Engineering IV
Robert E. Fischer; Warren J. Smith, Editor(s)

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