05-31-2016, 09:28 PM
I don't think so: 12 mm, 23 mm, 35 mm, 56 mm: all with focus drives, all silent when powered. But both OIS have also electrical aperture, but I tend to believe, the sound is an OIS on standby. I just don't get it so easily, when put on a tripod what good is it to use energy to keep something I don't need on standby?