Today I received the 12-35 lens from B&H today, and surprisingly the lens makes an audible "clicking" noise when I zoom in and out - is this normal or should I ask for a replacement? I also own the 7-14 from Panasonic and that lens is absolutely quiet when I zoom in and out. The reason this bothers me is although I don't do too much video on GH2, I still take videos of my daughter with it and that barrel noise would bother me... So if people could chime in, please. *I just realized that the lens makes noise only when the camera is turned on, but is quiet when the camera is off. Is this just me or are other experiencing the same thing? Are there any updates on this lens?