Just received my macro coupler yesterday, but haven't been able to play with it a lot yet. I mounted a 50mm f/1.8 reverse onto the end of my 105mm macro, and WOW it was amazing. I had to put the aperture to 1.8 for the 50mm naturally, and then focused all the way out to infinity. The best I could do with the macro was hit 1:1.5. I could basically see the hair fibers on a strawberry. I'm still getting used to the settings, like what to do with my macro lens and the 50mm to get the best macro shot. I have to get insanely close to the subject though =/ I'll post more results tonight.