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High-magnification variable-focus system (varifocal system, zoom lens system)
High-magnification variable-focus system (varifocal system, zoom lens system)
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机译:高倍变焦系统(变焦系统,变焦镜头系统)
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摘要
A description is given of a high-magnification variable-focus system which contains at least three lens groups. Seen from an object to be photographed, the arrangement is a first positive lens group, a second positive lens group and a negative lens group. The three lens groups are moved, during the adjustment of the focal length, from a position of short focal length in the direction of the object towards a position of long focal length. The negative lens group satisfies the relationship 3.3 mTn 6 and 2.5 mTn/mwn 4, mTn being the lateral magnification of the negative lens group in the case of a long focal length and mwn being the lateral magnification of the negative lens group in the case of a short focal length. IMAGE
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