Recently I bought a Sironar N 120mm. I only got around to mounting and using it yesterday. What I found is that it will not focus unless I have the lens practically on top of the subject and the lens board is wound back into the body of the camera housing. I tried different distances from the subject with the camera with no success. It appeared as if winding the lens back into the camera housing was the only way I could get close to a sharp image anywhere, with the best result when I was within a few inches of the subject.
Could it be the rear element is not the original for this lens? It looks genuine Rodenstock with similar design to the front element but it is smaller obviously by some margin. It screws in easily and neatly as well. I'm at a loss to explain it other than the possibility the rear element is not original.
Any tips of how to find the answer would be appreciated.
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