Just in case you are interested, and for the information of others who might read this, I will elaborate a bit on this Sears 135mm f/2.8 lens. Located right above the aperture ring, on the lens body side, is the wording "Sears Mod. No. 202- 7368100 Korea". At the objective lens, below the filter threading, is the wording "Auto Multi Coated 1:2.8 f=135mm 52 No. 860507723. The word "Macro" appears twice on the barrel. The letters "KR" appear on the barrel.
This lens had the protruding pin in its camera end that is faulted for hanging up when mounted on a K-mount Pentax. I remove that when I find it. I believe the pin, and maybe the "KR", indicate the lens was intended for use on Sears and Ricoh cameras.
The main focus ring occupies much of the length of this camera. It twist to attain focus, while the objective lens does not turn during focus. This is nice to havewhen using a polaroid filter, for it means you don't have to keep adjusting the filter.
Unless the Macro feature is used the minimum focus distance is about five feet.
The macro feature is operated like this. Turn the main focus ring until the minimum focus distance is attained. Then turn the objective lens end clockwise (as when pointing the camera). It will turn in three steps, each attaining a decreasing focus distance until the minimum of about two feet is reached.
I did not know how the Macro feature worked when I got this lens, and it had been set in its Macro state, so I could not axhieve anything near an infinity focus. I was so disappointed, as it was such a clean lens, but was elated to find it had the additional feature.
I have two of these, and will keep the best one. The second one is exactly like the firts except for its serial number being 860807070.
I also have an identical lens which has the barrel number Mod. No. 202-737370, with a serial number of 942091. This lens has no Macro capability, but seems to match the other two in all other respects. (last Para editted)