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I love CR's way of looking at DOF. Great easy advice. Any repeating pattern could be used to demonstrate the effect of stopping down or opening up the lens.
One item I will add. Unless the lens is a macro that can better handle very small apertures like f22, most lenses give the best optical performance between f8 and f11. Sharper and better resolution. At very small apertures you get diffraction of the light as it passes through the aperture (bending of light rays). It will actually make the image look a little soft.
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