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Proceedings Paper

Bidimensional Lens Systems : A Rational Approach To Group Displacements During Focusing And/Or Zooming
Author(s): Jacques P. L. Angenieux
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Paper Abstract

Modern objective lenses for cinematography, television or photography, and particularly zoom lenses, are composed of several groups of lenses which are axially displaced during zooming and/or focusing. The number of these groups has increased recently as well as the complexity of their relative movements and functions. In this paper, we give a short history of zooming and focusing techniques ; we discuss the inconvenience of traditional solutions. We then introduce the concept of bidimensional law. We propose a systematic classification of possible lens-types according to the 4 possible types of group. We finally present a few types of lenses in the form of truth tables and parametered diagrams explaining which groups move and how during focusing and/or zooming.

Paper Details

Date Published: 10 June 1987
PDF: 7 pages
Proc. SPIE 0766, Recent Trends in Optical Systems Design and Computer Lens Design Workshop, (10 June 1987); doi: 10.1117/12.940223
Show Author Affiliations
Jacques P. L. Angenieux, Ets P. Angenieux (France)

Published in SPIE Proceedings Vol. 0766:
Recent Trends in Optical Systems Design and Computer Lens Design Workshop
Robert E. Fischer; Carmina Londono, Editor(s)

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