This is the lens that has been on my camera the most. For the past 12 to 6 months I have had the IS turned off as the lens chatters at times. I tried it out on the 7D2 the other day and had the camera lock up several times and focus was a bit spotty. It has been on my list to send the lens back to Canon for a tuneup and I think it is time. Other than these recent issues this has been the lens that was on my camera the most.


