Hello, I picked up a Canon A1 and it has a Vivitar Lens stuck on it. It's a 75-205mm 3.5. The red dot of the lens is at an exact 90degree angle and I can turn the ring counter clockwise about an inch or so. Beyond that it's absolutely stuck. For trying to remove the lens I set the aperture to 3.5 I've been using a T70 for some time on which I mounted a Canon 1.8 50mm with the ring type, it mounts very easily and it's absolutely not possible to turn it to 90 degrees, there's about an inch in between to that point. About the same spot where the Vivitar is stuck on the A1. Now I worry that the Vivitar lens might be put on incorrectly because I can move the ring pretty easily between this one inch from the 90 degree point. Is it safe to try a strap wrench to remove the lens or might this damage the mount? I'm unsure if it was over tightened or put on incorrectly. If I'm risking damaging the A1, I'd rather keep the Vivitar lens on it because it seems to work. I can not see the aperture in the lens tho. Hope someone has an idea, thank you!