Set the focal length on your lens.

给你的镜头设置焦距。

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Focal length: The distance between the centre of a lens and its principal focus.

焦距：镜头中心与其主焦点的距离。

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Focal length: The distance between the centre of a lens and its principal focus.

焦距：镜头中心与其主焦点的距离。

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