XR Rikenon 135mm 1:2.8
Very good condition. I got this one because it's optical diagram is almost identical the the Super-Takumar/S-M-C Takumar 135mm/3.5 forum.mflenses.com/new-toy-rikenon-135-2-8-t32747,start,2...
Not entirely though since it has a wider entry pupil. Also the rear element is much closer to the mount (there might be some logic to that, if the diameter was enlarged the distance between elements probably was too.
XR Rikenon 135mm 1:2.8
Very good condition. I got this one because it's optical diagram is almost identical the the Super-Takumar/S-M-C Takumar 135mm/3.5 forum.mflenses.com/new-toy-rikenon-135-2-8-t32747,start,2...
Not entirely though since it has a wider entry pupil. Also the rear element is much closer to the mount (there might be some logic to that, if the diameter was enlarged the distance between elements probably was too.