Has anyone had experience doing this? I do have the version that you can remove the collar (there's a "remove" arrow you have to align), but when I loosen the screw as described, the collar doesn't move at all. Thanks.
I actually figured it out. Read on a 10-year old forum that Sigma sometimes glues those rings in, and to use a hot hair dryer and exacto knife to pry away the glue and that's what I did, and it worked!
I actually figured it out. Read on a 10-year old forum that Sigma sometimes glues those rings in, and to use a hot hair dryer and exacto knife to pry away the glue and that's what I did, and it worked!