Im still trying to learn Macro with my reversed 50mm and ext tubes. But the advise ive gotten from you all doesnt make much sense to this point to me. Please explain further to a low "C" student. You have said that I could try changing my f/stops. I am shooting with a Canon XS with a 50mm in reverse. When I reverse the lens the F defaults to 00. I can not change the f when it is reversed at all. Obviously when I add a tube on it it make the area of focus that much smaller. I have tried changing the f stop prior to reversing the lens from 1.8 to 22 and when reversed the image is still the same. So, two questions. 1. Is is possible to change my f when this particular lens is reversed (Canon 50mm prime 1.8)? 2. What lens would you recommend for a very raw noob to begin to capture some good Macro.