Sudden stiffness in zoom ring of 70-300mm ED
I have had my 70-300mm ED zoom for about four months now and the zoom ring always was smooth with a bit of stiffness but today when I put it on I noticed right away that it felt different. It seemed more stiff and a bit rough, the only thing I can think of is dust inside the mechanism. I always keep it in my bag and am very carefull with it. Has anyone ever experienced this with any zoom before?