Focus stacking is a technique that will give your macro shots much sharper focus. Here's how to get started with a dSLR.

(Image by Muhammad Mahdi Karim CC BY-SA 3.0) Stay Focused (free with in-app purchases) is an interesting app that does a very complex function for photographers called Focus Stacking.

To focus stack effectively, it’s desirable to move the camera in very small increments of sub-mm precision, in order to get different parts of the subject in focus.