The basic difference between the Main, Aux, Posing, Face, Hand CAmeras et al, and the Dolly Camera, is that the dolly camera rotates around its own axis. All the other cameras rotate around an external point - in the case of Maain and Aux, I think it's the zero point of the scene (though could be wrong), while the Face and Hand Cameras - well, it's kind of obvious what they're parented to/rotate from. This means that the dolly camera is the ideal one to use in animations where you want to get a feeling of the camera being 'held' by an operator. When the dolly cam rotates, it doesn't move in space as well. Hope this helps. jonthecelt