Use a Drop of Water as a Macro Lens for Phone Photographs
Here’s a super cool trick: instead of buying a special macro lens for your smart phone, simply use a drop of water! Carefully place a drop of water over your lens, carefully invert the phone, and voila — instant macro shots with the cheapest lens you’ll ever own. Alex Wild over at Scientific American has more details on the technique and some great sample shots taken with it.
Transform Your iPhone Into a Microscope: Just Add Water (via Gizmodo)