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A cleaved Zuiko Digital EX-25 extension tube with electrical bypass cable. What I essentially have done is cleaving the tube and putting in a set of OM-bayonets in the gap. The resulting tube is only 1 mm onger than the original but now it is possible to add extension tubes, a macro tele converter, bellows, etc between the camera body and any Zuiko Digital lens with maintained AF and aperture control from the camera body.
A cleaved Zuiko Digital EX-25 extension tube with electrical bypass cable. Here with a set of soligor OM extension tubes, adding 64 mm, added in-between the camera body and the Zuiko digital 50mm f/2 macro lens. Auto.focus and aperture control is maintained.