I've been using a 50mm 1.4 with extension tubes for macro and it gets the job done. Though is a pain to setup each time with the manual setting of the aperture with stop down button, the loss of light and lack of AF can be dealt with but it's extra time taken. I borrowed a macro lens for another wedding, and found that I used it more for portraits than actual macro, so personally I don't see myself getting much out of investing in a macro, an extension tube setup, or just using a lens that focuses close enough, and then cropping the image can be fine as well. Would be wise to rent/borrow a macro lens to try out once, and also, shoes don't really need macro unless you want to get the very fine detail