50L focus "slippage"?

hey guys

my beloved 50L .... it feels like the focus ring is "slipping". if i slowly move the focus ring between the two extremes, i can "feel" sudden jump in the focus ring sometimes. and it happens at pretty much any place in the turn.

is this normal? i dont think this existed before on my 50L.

does this mean something insidee is busted? like uhhhm some gear teeth?

can this be fixed by canon? if so what kind of price?

thanks

I can't say I've ever noticed the same behavior with mine. Sounds like something could be amiss?

i have been getting some wildly OOF shots at times... i dunno if this is the reason?

damn, this is my #1 lens.

Sounds like something's wrong in the gearing and/or lubrication of same. Maybe some grit in the works (though this is usually more obvious in feel and sound).

theres no sound.. its just... like its jumping a gear teeth or something... turn the ring, and at random spots it just jumps.

anyway i gave it to canon to take a look

My 100L did this once. The focus stuck, then loosened, but with the slipping you're talking about for a short while. The next day it was back to normal and it hasn't cropped up again since. It was odd.

I've seen it on a few USM lenses. I think it is worse in more humid situations actually (purely based on them coming good after being in A/C for a while and then not doing it again).