I own a Canon SX 100 IS digital camera. It's a good camera but suffers from noise problem once the ISO is cranked above 400. A bit is seen even above 200. Now I need to shoot some laser shows & fireworks at night in the coming day or two. I do not have a tripod. What do you suggest to get good snaps under the above scenario. Also bear in mind most of my shots will be zoomed to the max i.e. 10x optical zoom. At which ISO should I shoot? Any other things which I need to know to get good pictures without tripod?