Debating adding a 18-55 STM to my kit, I know it sounds bizzare. Thinking about it just for video on the 70D, yes I know it comes as a kit. Right now I have enough reward points to pretty much get one for about $50. I can hear focus motor noise from the 17-55 during video and am wondering if the STM would make sense for quiter/smoother focusing and a lighter rig for extended video recording.
For those who have the lens, how does it do optically?


