By right no, I can't really explain in technical terms,but the adapter sort of adds back the dept of the mirror which allows the 4/3 lenses to be used on the m4/3s,in that case,adding a OM to 4/3s adapter onto the m4/3 body is akin to just using the om to 4/3s adapter on a 4/3s body. Used it for a while and never had any problems,just too lazy to focus manually