I shot this panorama a total of 11 times while I was waiting for the sunrise. Exposures for the beach, and exposures for the sky. With ND filters and without. Never sure when the peak colour would appear in the sky. The final image is a 6 column x 2 row panorama using 3 exposures (ground, sky and sun). When shooting on expensive sheet film this used to drive me insane with worry - did I capture the peak moment? It still bothers me, but at least digital removes the worry about cost.