"By using a home-made helicoid adapter with rangefinder coupling."
Any chance to see more info about it? Please.
I have couple of miniature enlarger lenses, which I not use for enlarging, but it would be great to have them coupled with RF.
It's rather complicated. I could never have done it on my own. The basic work Henry, a friend of mine, has done. He is some kind of lens tinkering genius.
It all started with a version for Sony NEX cameras. NEX adapter as a bayonet mount, a turned aluminium ring which holds the helicoid, basically a spiral walk and a taking ring with an M39 thread.
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Here << Henry describes it in another forum.
He later tried a version for Leica M mount using a Leica M8 and trial-and-error. With this he was able to adapt a Rodenstock enlager lens to the M8.
But it didn't work with the Focotar which has a different flange distance.
Since I own an M(240) with live-view, I wanted to optimize it and get my old Leitz enlarger lenses working. I bought a Leica-version from Henry and tried to use different thread rings but none did work. I found out that I needed an 8mm one and Henry turned one for me. That worked out great and I could adjust it to the rangefinder.
It is necessary to say that this helicoid only works with a 50mm lens. Other focal lengths would need different thread pitch.
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And my Varob 3.5/50 cannot be adapted, since it has the same flange distance as the Elmar 3.5/50 (which is optically the same). But I can use that one with a helicoid adapter on my Sony A7II.
