Just received a 28-135mm IS lens that I purchased off of eBay. First problem.
Loaded it on my D30 and Elan 7 and seeing the same problem on both. Here are the problems I am seeing:
1 - Autofocus is very slow and sometimes doesn't lock at all in low light.
2 - Switched to MF and the focus ring has "A LOT" of play in it. Sometimes I have to give it a few revolutions before it actually starts spinning the lens to focus.
3- Back to AF mode, trying to Auto Focus and it went into the Macro range never to return. Switched to AF and the lens is locked up. It won't autofocus out of macro. Due to problem #2, cannot use the focus ring to turn out of Macro.
Haven't talked with the seller yet, thought I would come to the professionals first.
Ever seen this happen? Even though there are no signs of damage anywhere, and the glass is perfect, is the lens busted on the inside?
Going to ship it back today, but I am still out the PayPal fees. $10 or so. Live and learn. 
