My title says it all. I'm curious how I'm able to stop down on my E-M5 using my adapted M.Zuiko 9-18/f.4-5.6. Shouldn't I only be able to go to 5.6? I've been able to stop down to f8, f9, f11. How is this possible, or am I clueless as to what 1:4-5.6 means?