Photo special terms. When the infinity of parallel light entering camera lens, the light will be refracted to the lens axis, forming a little while, this convergence point is the focus of the lens, which is the lens of the photo scene such as the clearest point of junction. from the camera's main focus and the focus of a large number of deputy posed perpendicular to the axis of the plane known as the focal plane. Ganguang Pian where the camera is installed at the focal plane position.

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