Don't know if it's the right forum for this but: I've had some AF problems with my Tammy 18-270 for a short while, and since yesterday it seems like it's gone for good. It hunts forever and never acquires any target, even the most "contrasty" ones I can point it to (be it moving or static subjects). I've used alcohol to clean up the contacts on the mount (lens and camera) to no effect. The lens itself seems clean and hasn't fallen or anything. Manual focusing works ok but isn't exactly practical for my use. Stabilisation works fine. It's been out of warranty for a while. Any suggestion?