I just purchased this used, and while the overall condition and image quality are okay, the auto focus motor is very noisy. It's not affecting the operation of the lens, and I don't shoot video so that's not an issue, but it's still very annoying. Is there anything that can be done about this, or am I just going to have to learn to live with it? A newer macro lens, like the 100mm, just isn't in the budget right now.


