This is the kind of stuff the internet is good for: Photocritic.org offers an absolutely incredible how-to for creating a macro photo lens out of a Pringles can. Not a focusing tube, not a light restricting snoot, but an actual lens for brilliant close-up photography. I guess the lack of lens makes the depth of field a sweet-spot/luck of the draw deal. Get it where it's best, and it's amazing. Via.