I have been reading this thread with interest. I did use this technique some 30 years ago with my Pentax Spotmatic using a 200mm on the camera with a 50mm lens reversed. I still have them and the coupling ring.
However, the lenses that I now use have much larger diameters. I have the following
100-400mm diam 77mm
24-105mm diam 77mm
10-22mm diam 77mm
200mm diam 72mm
Do I have any hope of getting a suitable coupling ring?
Dave
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