I'm beginning to give up on the idea of ever getting this right but I can't work out what's going wrong.  I'm trying to have a spacecraft flying with a camera tracking it.  Now as far as I can see if I have a pretty much straight path for the ship to fly down and I keep the same rotation on the camera and set it up so that it's in the same position in frame at the beginning and end of the flight it should stay in the same part of the frame throughout.  Why do the speeds of the object and the camera seem to end up as different?

What I'd love is something that will anchor the camera so it's always pointing at an object but I'm not sure there is one.