I did a search and didn't find much info. It seems that the Y-S mount is unique to the sigma lenses made in the 60's. I read on one page that it is nearly equivalent to a T-Mount. I also ran across some info about adapters. It seems like you can use the lens with a variety of cameras once you find the right adapter. It's a 42mm mount but from what I've read the threads are NOT the same size as the M42 Pentax mount.
Do a little research online.
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