so a while back i had a little issue with my 85L with the AF slowing down when i point the camera straight up. i guess the motor was weak and couldnt push the front element out. but when the camera is facing forward it would work 100% full speed and locked in perfect every time.
it seems my AF is beginning to go out and some others say the same. so instead of having it fail when i most need it ill go ahead and send it in to get repaired since im not really using it right now.
1 1/2 weeks later i get it back from canon. quite fast! it says AF USM failure. causes autofocus to not work properly at times. AF USM replaced, checked, cleaned, and calibrated.
i get it back and it looks clean. had some dust behind the rear glass thats now gone. i mount it on the camera and WOW... THE LENS AUTOFOCUSES IN CHOPPY JAGGED MOVEMENTS, WHEN IT DOESNT DO THAT IT GOES REALLY REALLY SLOW, LIKE 30 SECONDS TO GO FROM MFD TO INFINITY. AND IT DOES NOT LOCK ON TO ANYTHING AT ALL!!!! also when at infinity the barrel starts to retract on its own slowly going back to mfd all on its own.
wow now it doesnt work at all... its completely useless. called them up and theyre sending me a label to ship back. at least theyre gonna try to repair it again. hope it works this time