I recently acquired this lens, and noticed that there is some stuff long the edges of the inner elements, both just above the level of the blades looking from the front
and also a rim of stuff just above the level of the blades looking from the back.
It is not on the blades themselves, which look clean and move fine. Rather, its on a ledge or rim sitting on either side of the blades.
It almost looks like maybe paint or dried glue that's flaking off a bit.
Functionally, the lens works fine, and this doesn't seem to have any noticeable effect on the photos, but I may have this looked at if it is going to become a problem over time, since I like the lens and it wasn't very expensive.
Appreciate any thoughts or insight...