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In the case where magnification is held constant changes in focal length will not produce increases or decreases in DOF. For example (full frame sensor): a 55mm lens 6.2 feet from a subject yields magnification of X.03 and at f/3.5 DOF is 10.5 inches. A 200mm lens 22.25 feet from a subject yields magnification of X.03 and at f/3.5 DOF is 10.5 inches.

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