Hi All, I'm reading reviews of the Nikon D5100 and while I see that it's a wonderful camera, the camera does not have a focus motor (like, for example, the D7000 which has a built-in AF motor). In practical terms though, what does that mean? Will it not focus the lens? Will it focus more slowly? What, if any, are the effects on performance, speed, etc. Thanks for the help! Alan.