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Proceedings Paper

Zoom lens without focus-breathing phenomena
Author(s): Kazuo Tanaka
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Paper Abstract

Assuming that exit pupil position is fixed, it is presented a zoom lens having a focusing mechanism which does not give rise to any changes in the angular field of view. A frontal part set in front of the zooming part consists of two movable components for focusing. The paraxial condition in which no focus breathing phenomena exist is, in general, derived. Explicit expressions of component-displacement are obtained together with the relation to one-movable component focusing method. According to the analysis, a zoom lens is designed to show the usefulness of the analysis.

Paper Details

Date Published: 14 December 2001
PDF: 5 pages
Proc. SPIE 4487, Zoom Lenses III, (14 December 2001); doi: 10.1117/12.450421
Show Author Affiliations
Kazuo Tanaka, Canon Inc. (Japan)


Published in SPIE Proceedings Vol. 4487:
Zoom Lenses III
Iain A. Neil; Takanori Yamanashi, Editor(s)

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