Hello all, I just received my adapter, (I like to call it my decoder ring!) so i can mount my old 70's Zeiss lenses on my Olympus OMD EM10. After sorting out how to get focus peaking to work, (I had it working fine for my modern lenses but it's a bit of a different process with the old ones), I set the mode to "S". I figured that if I can't change aperture through the body of the camera, then at least I could control the shutter speed through it. I got some very good results. The one thing I couldn't wrap my head around is how does light metering work with these old lenses? I read that it would work but it didn't make logical sense to me if the camera had no idea what aperture I was using. Thanks for your help.