For macro I use my Canon 40D with a 100mm Canon macro lens which gives a standoff of about 50 cm for 1:1. To freeze movement, to increase depth of field and to darken backgrounds I use a Canon 580EXII flash and high speed sync.The camera is set manual, the desired aperture is selected and the flash used to control the amount of light for the correct exposure.
|My macro setup|
I have included a couple of videos for further more detailed help. I recommend Digital Macro Photography Ross Hoddinott published by PiP