Depth of Field
What is depth of field? As some object has clear focal image, there is certain long distant can also be clearly focalized. The distance ranges from front of focal object to back of focal object. This distance is so-called Depth of Field. Depth of field involves foreground and background, and background is deeper than foreground. If depth of field is deep, camera can clearly see the object far from focal point; otherwise, if depth of field is shallow, camera cannot clearly see the object far from focal point.
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