Hi all. Not sure what forum to put this one in. Last fall I bought a used package deal locally for an E-P3 with a bunch of lenses and accesorries. Amongst them, was an Olympus MMF2 - 4/3 to micro 4/3 adapter and a 4/3 mount version of the Sigma 105mm 2.8 macro. I only used it once to try it out and make sure it worked. It was super cool. It focused blazingly fast. Nice close focus for macro work and the 2.8 aperture was nice and fast for a lens that long and was quite sharp. That was on the E-P3. Then I traded the E-P3 for an X100 and kept the lens and adapter for possible use with the Panasonics. I got so busy with the X100 I almost totally forgot about it. Then yesterday, I went a photowalk and figured it might be nice to have a fast tele AND macro to bring along and support the X100. It doesn't work with the Panasonics. It won't even allow me to set the camera to AF. Are these 4/3 to micro 4/3 adapters brand specific? Can anyone with cross brand experience with these adapters chime in? If it's not going to work, I'll either have to sell the adapter and lens or sell off the Panasonics and buy an Oly.