I briefly used a reversing ring back in the days when I had a Praktica Super TL. Certainly gave excellent results but was slow and awkward to use as all connections between lens and camera body were lost necessitating using stop down mode using my finger to push in the aperture lever. I think you could get another ring with a connection to a remote control to do that but I never did as I preferred the close up filters as being easier to operate while still giving very good results if stopped down to f8 or so. The subject to lens distance was very small with the reversing ring and gave 1:1 magnification which was fixed, focussing was by moving the camera backwards and forwards.
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