To avoid a composite in the camera or PP one have to pay close attention to the distance between forground an d background. DOF and shutterspeed also have to match perfectly. When using a very narrow angle of view, objects in the appear to race across the sky. That will force you to compose the picture with the object outside the frame, coming in to the frame. Especially when using some form of exposure delay, which is almost required using a telephoto lens. A composite is a much easier path to follow. To mimic the scene as it appear for the viewer a composite might be better. As with your tent and moon picture Øyvind, a composite would have renderd the scene much more authentic. But as a single frame your picture bring me good memories of the great outdoors.