Originally posted by drabina Lowell Goudge, I think you are right. When I have compared my FA lens the 4:30 pin is same on both lenses so it cannot cause the locking problem. Now the 6:00 pin goes right thru the AF drive pin.
Now in my lens, the 6:00 pin is less than 0.5mm (1/32"?) above the mount. Do you think it could still cause the problem and the lens could lock on the camera? I have mounted the lens on my istDL few times and it came off with no problems. That was before I knew about the locking pin. Now I simply got scared because I do not want to use hacksaw to get the lens off next time it does not come off.
I can't honestly say what the risk is.
Some people have in the past reported that if you put the body in AF and let the focusing screw turn, sometimes the pin is pushed back. But as I stated earlier, I have never owned one of these lenses so I just DON'T KNOW.
If it was my lens and having taken lens mounts off in the past and done lens conversions, I would not be afraid to take th emount off and remove the pin properly (so that I could restore the lens if someone wanted it). But again, that is me, I don't know if you have the confidence or the desire to take the lens partially apart.
I do know I would do something if I want to mount the lens, because the perceived risk is too high of getting it stuck.