John


I have both the 100mm L and the 180mm L. I doubt I use the flash much with the 100mm L because when I use a tripod the 180mm will be the lens of choice.


That may be why B&H said the step up ring would work. Since I had to have the 72C any way, and I think the step up ring to use the 72C on the 100mm would be a cheap work around. Save about $20.


I am going back to the camera store today, thinking back maybe it was not a 67C we were trying to mount. What I remember the labeling saying was that it is a Canon 67mm macro adapter. To me it appeared to be a step up ring, a very expensive one it was $32.00. Still the most likely option is that we didn