*Here is my response to Canon. I do mostly still work, but also video. Thanks to WIKI TANGO - I tried a bit of video and that squeak is wretched. It will have to go back in. The lens chirp sounds like squeaking breaks from a car.
I appreciate your continued and timely correspondence. Although you have deemed the squeaking 'normal,' it severely detracts from my ability to shoot video. I am a nature photographer. I may be able to work around the squeak for stills, although it is most definitely unnerving, but it proves to be unacceptable during filming. Each time I retract the zoom during filming - my audio picks up the squeak. To compound the issue, since the squeak occurs directly next to the camera body/microphone, it amplifies the sound.
I can not shoot acceptable video with this lens in it's current state and therefore; I can not accept your response that this squeak is 'normal.'
I have owned numerous Canon lenses, none of which have ever exhibited a squeak, even after 10 yrs of rigorious use under adverse conditions. I have subsequently owned many brand new canon lenses, none of which ever exhibited a squeak of any kind.
Canon has continually made top tier products and stood behind them with top tier service - I sincerely hope that you will continue to do so.
There is a problem with this lens - I trust that you will address it.
Thank you for your time,