Received a 135mm f/2 and was playing around with it a bit. I noticed that the AF is extremely fast but it makes a noticeable sound especially when going doing AI SERVO with a lens cap on, like as if a motor was actually revving.
I made a poopy quality video with my cell phone to show what it sounds like:
I watched some other videos and noticed they had this same revving noise.
Wanted to know what you guys think? Is this normal... I've owned several other L lenses like the 24-70 and 70-200 and they were extremely silent.