or am i over my head on this one
hi i was going back and fouth on this one dof is as hard as it gets for me but i figured i give it a shot, what i wanted to do was blur the shells at the end of the line and hope it will give the look of speed and dof, can i start with two camers one on each line of the shell
You should set up two or more cameras, but maybe not for the reason you think (if I'm understanding your question correctly). You only need one camera (Camera 1) for the render and depth of field; the other camera(s) ais/are just used to help you get your Camera 1 set up correctly. You'll want a second camera (Camera 2) off to an angle from the first one, not facing it directly. While you're looking through Camera 2, go to the Cameras tab and select Camera 1. Turn Depth of Field on and you should see something like this: http://www.daz3d.com/forums/viewreply/66500/
That .view will help you follow the instructions and tutorials that you can find in the first few pages of the thread. Hope this helps!