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20 September 2002 Power Allocation for Varifocal Lens of Two Groups
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The inverted telephoto lens consisting of two groups is required when a long back focal length and a wide field of view are needed. Varying the air space between these two groups would change the effective focal length. In this paper, power allocation for this varifocal lens affected by aperture, field of view and amount of variation of air space is analyzed. The solution of power allocation is introduced, from which large aperture, wide field of view, and small volume is benefit. Six equations, i.e. power region equation, aperture equation, field of view equation, back focal length equation, movable region equation, speed equation, are derived to guide power allocation of this kind of optical system.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Chengliang Wang, Xiangning Li, and Liqing He "Power Allocation for Varifocal Lens of Two Groups", Proc. SPIE 4927, Optical Design and Testing, (20 September 2002);


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