My macro lens is constantly hunting for a focal point. It has recently started this and no matter if I'm using it for ring shots or portraits, good lighting or bad, it won't focus.It's never been dropped or damaged. I've had it for almost 5 years.
I have a 28 that isn't very sharp, but the other lenses don't hunt for focus like this one does. But I suppose I can't rule out the camera being faulty.
