Just received my used Sigma 17-70mm f/2.8-4 DC Macro OS lens. Looks to be in good condition. Attached it to my D90, switched it on and the lens was making a quiet beeping sound almost like morse code (maybe someone is sending me a subliminal message). It is there whether it is on auto, manual, OS on or off. I have never heard a lens making this sort of noise before. I have never owned a Sigma lens so is this normal?
Thanks
Brian
Thanks
Brian