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发明授权
US06985304B2 Lens system and camera 失效
镜头系统和相机

Lens system and camera
摘要：
A lens system comprising a first lens group with a negative refractive power, a second lens group with a positive refractive power, and a third lens group with a positive refractive power arranged in this order from an object side, wherein a focal length f2 of the second lens group, a focal length f3 of the third lens group and a radius of curvature Rm of an object side-surface of a lens that is closest to the object side in the second lens group satisfy following conditions 0.30
摘要（中）：

一种透镜系统，包括具有负折光力的第一透镜组，具有正折光力的第二透镜组和具有正折射光焦度的第三透镜组，所述第三透镜组从物体侧依次排列，其中焦距f 2 第二透镜组，第三透镜​​组的焦距f 3和第二透镜组中最靠近物体侧的透镜的物体侧表面的曲率半径Rm满足以下条件 -formulae description =“In-line Formulas”end =“lead”？> 0.30 <？in -line-formula description =“In-line Formulas”end =“lead”？> 0.8

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