Having recently shot both horse racing and bicycle racing for the first time, I got a lot of useful feedback on the images. One of the consistent comments was that the images were out of focus. Someone suggested that I view them in ViewNX to see where the focus was. Well - I did that and found that a substatntial number of images had NO focal point on the image (per ViewNX). Most of these images were in the middle of a string of images shot in Burst mode, but others were not. I was using AF-C and was trying to follow fast moving horses (from the side) and not-quite-as-fast moving bikes (mostly from the front or 3/4 view). The lenses used were my 55-200VR (mostly) and also some with my 17-55/2.8, all handheld. Is this phenomena caused by poor shooting technique? Or could there be an equipment problem? Is there some kind of test that I can try to determine why some images don't have a focus point at all? I could understand having the WRONG focus point with fast-moving subjects, but why NO focus point? Thanks!