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Leica R 50f2 Summicron AF (!)


chrismuc

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A few days ago a friend of mine showed me his legacy SLR and lens and I couldn't believe my eyes: He completely disassembled two lenses: a Leica R 50f2 Summicron lens and a Nikon 50f1.8 AF. He took only the internal lens group of the Leica lens and mounted it in perfect position into the stripped down lens barrel of the Nikon lens. So the Nikon AF drives the Leica glass within the Nikon lens and also uses the remained Nikon auto aperture. Works perfectly on his also legacy Kodak DCS Pro SLR/n:-)

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Actually I did another weird thing: Took a Leica (Schneider) R 28f2.8 PC lens, machined away the complete shift mechanism, added a Contax 645 mount in order to use it on a Contax 645 body with MF digital back. The 62mm image circle of the PC lens nearly covers the 54x40mm sensor giving a 19mm 135 format field of view.

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Believe me, it's real. I am German, but the camera and lens belong to a Chinese friend in Guangzhou and there are several Chinese photography guys talented in doing unusual lens conversions.

 

Don't get me wrong... If this is indeed real then well done to your friend.

 

What really puzzles me is the use of the "Nikon auto aperture" mechanism with the Leica lens group. That would be very difficult to engineer.

 

EDIT: I do like you PC lens conversion.

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I will ask him how he did with the auto aperture. I assume it was impossible to change the position of the aperture in the Nikon lens, so it was pure luck that there was no interference with the Leica glass while ensuring that the Leica lens element was in perfect position to allow infinity and allow the af focus shift range to work properly.

Such lens surgery only can work with lenses without floating elements and the "mother lens (af)" must have same or larger aperture than the lens element to be implemented to provide enough space in its "belly".

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  • 2 weeks later...
I will ask him how he did with the auto aperture. I assume it was impossible to change the position of the aperture in the Nikon lens, so it was pure luck that there was no interference with the Leica glass while ensuring that the Leica lens element was in perfect position to allow infinity and allow the af focus shift range to work properly.

Such lens surgery only can work with lenses without floating elements and the "mother lens (af)" must have same or larger aperture than the lens element to be implemented to provide enough space in its "belly".

 

Fascinating thread, I would love to see some more.

 

Could you kindly link your thread to one I started earlier with a hope to pool all conversion information.

 

http://www.l-camera-forum.com/leica-forum/leica-m-lenses/265496-show-us-your-conversion-adaptation.html

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