plastic collars around them that keep the barrel tracking properly within it’s grooves
My OCD can’t handle that apostrophe.
(Yes, I’m just compensating for my feelings of inadequacy before such a mighty piece of research.)
There’s a lens called ”EF-S 18-55mm DC” on the markets now too. Haven’t researched it much so I’m not sure if it’s just one of the previous models rebranded or a new revision. At the very least it appears not to have IS.