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The device is by evaluating the image definition to automatically search the focal plane.
该装置借助对图像清晰度评价来自动搜索到正焦面。
youdao
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Focus: plane of focus; focal length; and depth of field.
焦距：焦点平面，焦距和景深。
youdao
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Focus: plane of focus; focal length; and depth of field.
焦距：焦点平面，焦距和景深。
youdao