Focus: plane of focus; focal length; and depth of field.
焦距：焦点平面，焦距和景深。
A measuring system of the focus plane information of bigger aperture aerial camera was described.
提出了一种测量航空大孔径相机焦面信息的系统，论述了系统的测试原理和组成。
A measuring system of the focus plane information of bigger aperture aerial camera was described.
提出了一种测量航空大孔径相机焦面信息的系统，论述了系统的测试原理和组成。
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