I was fortunate to get this lens from My brother. When attaching to the adapter (R-5 camera body), the fit between the two was very tight and very difficult to attach. Almost felt like the threads were not aligned when attaching. Once attached, the c...
Could be but it was pretty evenly supported at the time. I am going to an authorized Canon repair shop tomorrow and have them take a look at it. My suspicion is this lens was made back in 1991 and there is just the slightest difference in measurement...