Its goog but could be better. try ISO 100 at f/8 on a tripod and open shutter with a cable release for the burst durartion. You we be suprised at the results.
ISO 64-100 @ f/8 ISO 125-200 @ f/11 ISO 320-400 @ f/16 ISO 800-1000 @ f/22
Thanks for your comments. I agree that my firework shots are not as good as I would like. I have lots of excuses but I should have practiced with my equipement the night before. Perhaps the strangest thing that happened was the open switch on the cable release locked on and I did not know it. The camera ceased to work for sometime till I pull out the cable release and stopped using it. I figured it out in the daylight within a few seconds.