I went to the reservoir, and I ended up with a lot of shots like this: See how the trees look blurry? I'm using auto focus and a pretty fast shutter speed, so it shouldn't be shake or OOF. I'm also using a good camera (50D) and a good lens (Tamron 28-70 f/2.8) so I'm guessing the problem must be me. So how do I improve the "me" part? What can I do differently and better to make my photos come out sharper. Shutter speed 1/400. F 11.4. ISO 400. Focal length 57mm. Thank you.