Design of a twenty-element long focal length zoom lens

Robert M. Malone; Brent C. Frogget; David A. Grafton; Frank R. Mitchell

doi:10.1117/12.22834

1 November 1990 Design of a twenty-element long focal length zoom lens

Robert M. Malone, Brent C. Frogget, David A. Grafton, Frank R. Mitchell

Proceedings Volume 1334, Current Developments in Optical Engineering IV; (1990) https://doi.org/10.1117/12.22834
Event: 34th Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1990, San Diego, CA, United States

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.

Citation Download Citation

Robert M. Malone, Brent C. Frogget, David A. Grafton, and Frank R. Mitchell "Design of a twenty-element long focal length zoom lens", Proc. SPIE 1334, Current Developments in Optical Engineering IV, (1 November 1990); https://doi.org/10.1117/12.22834

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