I saw some other threads mentioning "robotic" sounding autofocus noises from the Oly 75mm f/1.8 but they were older posts in the wrong (camera not lens) forum so I thought I'd try here. I actually sold my lens recently, as I realized I was never using it and this focal length is longer than what I typically shoot with u4/3rds. I bought it last year and it has barely been used -- literally 3 or 4 times. The buyer returned it to me claiming the noise is not normal and the AF should be completely silent, but for sure my lens is not damaged and its image quality is fantastic. What's the verdict on the noise? Should I send it in under warranty, or is the noise actually normal and this guy was smoking crack?