No, I was taking the lens apart for a bit more cleaning. I retained and set aside the little aperture detent bearing, but when I was putting the lens back together, my fumble fingers lost the bearing. So, now there's no detent in the aperture ring, and it drifts from its setting. It can be locked into place, however, for some of the camera's more automated settings... so it isn't a complete loss. I just want to find a ball and get it back to working properly.
Camera works fine, though. I have two other lenses, but I rather like 50mm