Do you think a CZJ 85/2 optical module will fit Jupiter-9 85mm f/2 M42 helicoid

[wilson.c]

I think this may work very similar to the 50/1.5 conversion. At least this way I can get more use out of my CZJ 85/2 than it does now in native Contax RF mount.

[Brian]

I tried this once, and it did not work with the specific lenses that I tried. The taper of the Zeiss optics fixture would not allow it to be screwed all the way into the J-9 LTM focus mount. The second problem is the CAM in the J-9 mount is set for the Contax standard, and not the Leica standard. It cannot be made to agree with the RF of the camera at all distances.

I only tried with one lens, Carl Zeiss Jena 8.5cm F2, Wartime lens.