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Proceedings Paper

Zoom Lens Systems
Author(s): Alan Ashton
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Paper Abstract

The design and manufacture of zoom lenses involves a range of scientific and engineering problems not normally encountered in fixed focal length lens manufacture. This is not solely related to the increased number of elements but also to the manner of use of such lenses. Two lenses are described to illustrate different approaches to the problems. In one lens having a specification of 25-250mm f/3.6 for 35mm cine the zoom action is achieved by sliding movements. In the second lens the specification is 20-100mm f/2.8 and the zoom action is obtained by rolling movements. The latter lens also achieves a shorter minimum object distance and superior optical performance. The lens elements are located in steel cells which are cemented into aluminium carriages using a flexible adhesive so as to obtain improved alignment over a wide temperature range.

Paper Details

Date Published: 25 September 1979
PDF: 7 pages
Proc. SPIE 0163, Advances in Optical Production Technology II, (25 September 1979); doi: 10.1117/12.956916
Show Author Affiliations
Alan Ashton, Rank Taylor Hobson (United Kingdom)

Published in SPIE Proceedings Vol. 0163:
Advances in Optical Production Technology II

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