I for the life of me can not get a sharp image at the long end of this lens! I'm using a canon 80d handheld, even at 1/2000 f11 on auto ISO i'm just not getting the sharpness i was hoping for. Maybe it's my technique, maybe it's the lens... who knows. Before owning this lens i haven't used anything longer than a 75-300 Non IS. I do love the VC in this lens and it works well on the short end but at 600 i get soft images. Is it the nature of APS-C? How do i go about diagnosing whether it's me or the lens? How do people get beautifully up close shots on wildlife that are so sharp you can see bits of dirt on their feathers? My photos look like i dropped a kit lens IN the dirt and shot with it. Hints? I don't have any shots because i deleted them all lol.