Not sure...it could have something to do with the fact that I only have one coupler and that's 49mm to 52mm. And I only have one of each lens at those sizes - so I ended up putting a kit 18-55 (52mm) with a 50mm prime (49mm) and put the kit lens on the camera (nothing good was happening the other way around). The 50mm lens was wide open (f/2) - at f/22, it was like shooting through a pinhole. I couldn't see well enough to focus (but I want to play with it on a sunny day).
I think I'll probably order step-up and step-down kits next week and try some very odd combinations face-to-face.
