发明授权
US4264175A Focusing device in camera equipped with both standard and telephoto lenses 失效
聚焦设备在相机配备标准和长焦镜头

Focusing device in camera equipped with both standard and telephoto
lenses
摘要:
In a camera equipped with both a standard lens and a telephoto lens which may be arbitrarily selected for exposures by manipulating a first control knob, a focusing device is provided which selects the focusing ranges or depths of field of the telephoto lens by a second control knob only in the case of the photography with the telephoto lens.
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