I was wondering if anyone had this experience, and if you would recommend sending the lens in.
I am using a 70-200 f2.8L mk I
We've been going through a heat wave here in San Diego. I was outside photographing my son's soccer game right smack during the peak heat/sun. Suddenly, when I pushed the AF button on my camera, the lens started to make an audible hum. It is similar to when I am focusing in AI Servo with the IS turned on, but louder.
I think this is the IS unit because when I turned the switch off, it no longer made a sound.
AF was fine with the IS on (and humming) or off.
The lens was definitely warm from being in the sun (as was I!!!). I continued to shoot with the IS turned off.
When I got in the car, I had the air-conditioning full blast. When I checked the lens again after it reached ambient temp, it was fine. No hum.
Currently it is fine, but I'm not going to try to replicate the problem by going out into the sun.
Does this sound familiar to anyone? Should I bother sending it in? I'm afraid that they won't be able to replicate the problem, and I kind of need the lens over the next few months (soccer season).
Thanks in advance for any insight and advice