nhut-nguyen

*Update* I brought my 24-70 f/2.8L to Canon Service Center in Costa Mesa last Friday. I was told that the cable in the power diaphragm assembly over time would get loosened and stretched, the clicking noise is the result of this cable rubbing against other parts when zooming. The total cost is $244 including a new power diaphragm unit and 6-month warranty. I was also told that Canon will stop servicing this lens in January 2019. Canon Service Center is a very nice place, they have the whole Canon lens lineup there on display, man it was my first time seeing the EF 11-24mm f/4L USM, that thing is humongous!

I forgot to mention that there's a faint jerking that goes along with the sound, perhaps a loose spring.

Hello everyone, I need your advice on this. Recently I started to hear clicking/ticking noise coming from my 10 yrs old 24-70 f/2.8 version one. This clicking/ticking noise happens when I zoom from 70 to 50mm. It would happen once every 3-4 times when I zoom from 70-50. I also notice that when I take out my camera after a long period of unuse the clicking/ticking sound would be a lot louder and it happens when I zoom from 50-35mm. After that it would happen once every 3-4 times when zooming from 70-50. I searched online and found that many people who bought the version two in 2013 also experienced the clicking/ticking sound when zooming. The difference is some of the version 2's clicking/ticking sound happens out of the box, mine happens after almost 10 years of using. I have no idea what's happening here, should I send the lens in? The lens is sharp, focus is accurate and zooming is smooth. It's the noise that concerns me. Do you experience this clicking/ticking sound with any of your Canon zoom lens? Thank you in advance for your answer! Nate