Quote Originally Posted by newcan1 View Post
I just had this lens Ai'd and, testing it out, I find it to be quite soft at full aperture. The chap who Ai'd it did note to me that the lens rattles a bit (this was so before I shipped it to him). I decided to Ai it anyway.

If I shake the lens gently, it rattles slightly, and if I hold a tissue gently against the rear element and shake it, there is no rattle.

Thus the rear element would seem to be slightly loose, and I wonder if this affects image quality.

Anyone have any idea how to tighten the rear element of this lens?

It's not a bad lens, but I was expecting a bit more...
Ya think??

This is a world class lens. Yours needs work.