>>4177107Old Sigma AF shit is always sketchy, Canon AF?
>>4177108Blue one is not mine that's a Pete. I used regular 3M scotch tape and then I used Gorilla Tape for the spacer to get the 3M on the film plane, the Medalist has this weird film advance setup and you have to simulate it to adjust the infinity focus / rangefinder mechanism. Worked great, negatives came out spot on even at large apertures.
Here's a Teauxkina AT-X 28-70/2.6-2.8 that had a focus helicoid alignment issue. Took a second to get all the shims lined up for the focus gear but I got it. The circled area was loose and causing it to miss focus. Great lens and very sharp.