I am new to this forum and would like to piggy back on k2558's post. I have an Olympus c4040 with the pt-010 housing. I was pretty much wondering the same thing. I spoke with a salesman who said if I was only interested in shooting macro, that the ys-25dx would do fine. I have also seen ads for larger strobes that people are selling because they are shooting macro and would like a smaller strobe. Eventually I would like to do more wide angle, but for now, with my limited budget, and since I don't have a wide angle lens yet, maybe just sticking with macro and getting the ys-25dx. The price difference for a kit is about $160 which I can afford, though. So, if I get a ys-25dx, will that be preferable over the 90dx for macro? Will I regret not getting the larger strobe if and when I decide to do wide angle as well? Will it ultimately be best to have both, one for when I do macro and one for when I do wide angle.