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SUPPLEMENTAL LENS POSITIONING SYSTEM FOR A FIXED FSUPPLEMENTAL LENS POSITIONING SYSTEM FOR A FIXED FOCUS LENS CAMERA OCUS LENS CAMERA
SUPPLEMENTAL LENS POSITIONING SYSTEM FOR A FIXED FSUPPLEMENTAL LENS POSITIONING SYSTEM FOR A FIXED FOCUS LENS CAMERA OCUS LENS CAMERA
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机译：固定对焦镜头的辅助镜头定位系统固定对焦镜头的辅助镜头定位系统对焦镜头照相机
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摘要
A simplified open loop focus control system for a fixed focus lens camera that positions a supplemental lens into the optical path of a fixed focus lens, for relatively remote subjects, in response to a signal representative of subject reflectivity. Inserting such a lens in this manner substantially reduces focus control system complexity while at the same time minimizing the frequency of supplemental lens movement for most exposures which are typically of subjects that are relatively close to the fixed focus lens camera.
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