I have not used a ring flash for macro photography, which I have used several camera types for ( slr w/bellows and macro lens and medium format.) I occassionaly look at macro flash units and will probably decide on one eventually to assist macro photography since there are times when my subjects are dimly lit and the 35mm Olympus macro is a f:/3.5 max and many of my macro shots are outside. I would stay with Olympus' ring flash, their equipmemnt is tops (Olympus medical imaging is the gold standard.) I have my 35mm macro mounted on an E-620 and if necessary I use the built in flash, but some subjects would benefit from the ring flash, especially when ultra close, which this lens allows. The photos I've taken match any I've ever taken regardless of equipment userd. Hope this helps. Lawrence J.
Thank you, Lawrence, I didn't know that about Olympus and medical imaging, and it sounds like this is a decent lens and I could even get good pictures using the regular flash. Thanks! - Barbara R.