This is a large picture of the cover of The INs and OUTs of FOCUS: An Alternative Way to Estimate Depth-of-Field and Sharpness in the Photographic Image.

That diagram on the cover illustrates a graphical way to solve the lens equation: one divided by the focal length equals one divided by the lens-to-film distance plus one divided by the lens-to-subject distance. Any straight line through the black dot (at the top right corner of the square) represents a solution. The diagonal lines show how depth of focus and depth of field are related to each other.

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