I was the semi-official (read: unpaid) wedding photographer at a friend's wedding and for the most part, I'm very satisfied with what I've produced. However, I've noticed that some pictures are not sharp, although they should have been. I want to exclude errors on my part before I consider giving the camera into service. Here are a few examples, all of them are shot at 1/60 s, the usual maximal flash sync time in A. The aperture is always around 4, I chose ISO 400 and my Nikon D80 produced jpgs (I had to). In the following four pictures, the first three are not as sharp as I'd have liked them to be, the last one is what I expected. I've linked to the original. This is the `good one'. All shot with a Nikon D80, 18-70 kit lens; shots with my 80-200 zoom are sharper if you compensate for the dof and the longer focal length. Is something wrong with the lens? Or is it me, the photographer?