Unobscured reflective zoom systems

R. Barry Johnson

doi:10.1117/12.222835

5 October 1995 Unobscured reflective zoom systems

R. Barry Johnson

Author Affiliations +

Proceedings Volume 2539, Zoom Lenses; (1995) https://doi.org/10.1117/12.222835
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

All-reflective telescopes have found significant utilization in the astronomical community, government, and industry. Until recently, the concept of an all-reflective zoom telescope, particularly having an unobscured pupil, with meaningful capabilities was unknown. Several designs of unobscured-pupil zoom telescopes comprising only three mirrors are presented. The designs discussed have fields-of-view up to 3 degrees by 3 degrees, F/#s as low as 3 and zoom ratios of up to 4:1. The rms geometric blur diameter for one zoom telescope, having a 4:1 zooming range, was found to be 45 (mu) radians in the wide FOV condition (2 degrees by 2 degrees and F/4).

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R. Barry Johnson "Unobscured reflective zoom systems", Proc. SPIE 2539, Zoom Lenses, (5 October 1995); https://doi.org/10.1117/12.222835

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