I've put off writing this tutorial for a while because the technique I'm going to describe falls into a category that I call a "cheap trick" but it's so useful and results in such razor sharp images that I felt it was time to commit it to words. Even though I stumbled onto it on my own I'm sure that I didn't invent this technique -it's probably as old as macro itself.
I do all of my macro hand held (the critters I go after are normally too active for a tripod to be practical) and I'm always looking for a way to brace the camera. I don't crop and composition is important (keeping the camera steady helps me to place the critter where I want it in the frame). Also the flash can't freeze all of the motion in the scene. No matter how short the flash duration is it will never be short enough to give you sharp details if there is a lot of movement. I'm convinced that a lot of the image softness that people blame on diffraction is really nothing more than a form of "macro motion blur".