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Relationship of the f/n to the focal length and diameter: Photographic Science and Technology Forum: Digital Photography Review
A thin lens has focal length f , and its aperture has diameter d . If the central part of the aperture, of diameter d/2 is blocked by an opaque paper, the
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SOLVED:A camera has an f / 1.4 lens, meaning the ratio of focal length to lens diameter is 1.4 . Find the smallest spot diameter (i.e., the diameter of the first diffraction
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