I am using an OM fit macro lens with my E-M10. I want to use an extension tube for extra magnification. Would it be better to mount an M4/3 tube to the camera body and then the lens adapter,or to mount an OM tube directly between the lens and the lens adapter? Provided of course that I can find a set of OM macro tubes. I have full aperture and focus control on the lens and so would not need tubes with electrical connections.