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With an empty Pringles can and some lens and body covers, Photocritic devised a way to make a reliable extension tube for taking macro photos. You can make the tube for a few bucks worth of materials - unless you have spares, in which case it's free. Once it's made, you just wrap a standard lens in fabric, shove it backwards in the tube, and slide it in and out of the tube to adjust focus, similar to how a bellows would function. The photo above, which he took of a match head, really illustrates how cool this is, especially when you consider the cost.
