The RRS flash brackets were originally designed to attach to a telephoto macro's tripod collar. If your macro lens didn't have a tripod collar, RRS couldn't help you. But now RRS offers a plate with an Arca Swiss-style clamp that lets you couple RRS flash brackets directly to the camera body. Check out the setup in the last image in this gallery: http://www.pbase.com/fjp/macro_flash_2005_06_14 The flower pictures in this gallery were all taken with the setup pictured in the last gallery image, using the 105mm f/2.8 Micro Nikkor, a macro lens without a tripod collar. I think this combination produces beautiful results. The flash is mounted in a position where it illuminates from above the subject, like the sun, and produces a strong, modeling effect, better for things like flowers than a ring flash, which gives a flattened appearance, even with the two tube variety where you can turn one tube off. I really missed the fact that I couldn't use my SB-21 on the Nikon D70. But for the kind of stuff I do, I greatly prefer th arrangement pictured at the end of the gallery.