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You probably paid at least a few hundred dollars for the lens mounted on your dSLR right now. How would you like to play with a "lens" that costs you, maybe, five bucks? Now you, too, can turn your digital SLR into a pinhole camera by using the technique I explain in this section.
If you come to digital cameras from the film world, you might be way ahead of me. You likely experimented with pinhole cameras when you figured out exactly how cameras produce images. You can also use digital cameras as pinhole cameras. All you need is a pinhole!