Squeaking 17-40L

My lens is squeaking!! it happens on auto focus- it is most obvious when you engage autofocus with the lens cap on. Surely this isnt normal, but has anyone else experience this? or does anyone know whats wrong with it?

Many thanks A.

Maybe more about which lens it is. High pitched, low, grinding noise?

17-40L high pitched - not sure bout grinding maybe- a bit like nails down a blackboard

Only a couple things it could be. The USM or dirt in the barrel. I use a silicone cloth on my lenses. It cleans them and lubricates the plastic. I once got a piece of sand in the barrel pieces and it ground to a halt and never worked again.

Maybe try hand focusing while it's in auto-focus and see if you still get a squeak and try and determine where it's coming from.

no doesnt sqeak in manual only on the autofocus with the motor

ok so its developed a fault then, as this lens is 2weeks old??

Sounds like it's got a problem. I'd call Canon.

well i will take it back to store still within returns period

Definately. Tell them you want another one.

do that ASAP so there are less chances for problems for the exchange.

It sounds like the auto focus servo. probably no big deal but because its new I would get it replaced just incase.

well its only just developed it, it was fine for 2 weeks
awe damn it this was a sharp copy aswell.

I've never seen a soft 17-40, so fear not. I've had two, and both were very sharp.

did any of them squeak ronald?

Mine doesn't squeak at all. Best to get it exchanged while you can.

Treat me like a tourist wrote in post #2215471
did any of them squeak ronald?

mine is completely silent.

ed rader