Macro photography for wedding detail shots is one of those areas where you need a smaller aperture. I know it's been suggested by some high-profile photographer(s) that you shoot macro at f/2.8 but this is tough advice to follow. If you even breathe, your plane of focus changes for that close distance you're working at.
That smaller aperture (and I regularly work at f/11 or there-abouts), implies you will need a lot of light. A lot of daylight or lots of flash. When you're shooting indoors, this means flash, Read more inside...