I don't have this lens, but one of my ASPH wide-angle lenses loosened in front, possibly from airline vibration. I was able to tighten it by tightening tiny screws around the front area. Now I carry a jeweler's screwdriver on trips. I wonder if the lens in question has any small screws visible?
Edit: I checked, and as a matter of fact, the lens, in my case, was the 28mm ASPH Summicron. Coincidence?
“There is hardly anything in the world that some man cannot make a little worse and sell a little cheaper, and the people who consider price only are this man's lawful prey.”
Last edited by Rob-F : 05-07-2011 at 17:51.
Reason: Added more info