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  1. Oxford American Dictionary

    back focus

    • IPA[ˈbak ˌfōkəs]

    美式

    • n.
      the distance between the back of a lens and the image of an object at infinity.

    • noun: back focus, plural noun: back focuses

    • 更多解釋

    back focus

    • n.
      the distance between the back of a lens and the image of an object at infinity.

    Oxford Dictionary