25 September 1979 Zoom Lens Systems
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Proceedings Volume 0163, Advances in Optical Production Technology II; (1979) https://doi.org/10.1117/12.956916
Event: Advances in Optical Production Technology, 1979, London, United Kingdom
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.
© (1979) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alan Ashton, Alan Ashton, } "Zoom Lens Systems", Proc. SPIE 0163, Advances in Optical Production Technology II, (25 September 1979); doi: 10.1117/12.956916; https://doi.org/10.1117/12.956916


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