发明授权
US4299453A Zoom lens system with movable diaphragm 失效
变焦镜头系统,带可动隔膜

Zoom lens system with movable diaphragm
摘要:
The present invention relates to an objective lens for zooming by varying the distance between the divergent front lens group and the convergent rear lens group consisting of a first sub-group for forming a convergent light beam and a second sub-group between which sub-groups a photographing aperture is provided so as to be independent from them, whereby when the rear lens group is displaced forward for zooming the photographing aperture is displaced backward with reference to the first sub-group.
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