Get a tripod with you. A cable release can also be helpful if you can get that attached to the camera.
Try finding a high place for observing and shooting the sky show, with no unwanted obstacles.
Adjust your camera settings like this:
– continuous mode active with the maximum number of shots and about 1s delay between
– some cameras have a preset “fireworks mode” that automatically adjusts shutter speed and aperture (like most of the Canon models), but if your camera doesn’t have it, heres a hint: Shutter Speed: 2 , Aperture: 8.0
– if you done the first step, don’t worry to much about the ISO so let it as low as possible for low noise; also don’t set the flash on
– if the camera has a sharpening adjustment control, set it to very sharp
When actually pressing the shutter button, wait for the burst to explode, but, until that moment, keep the button half-pressed (focused ready). Then, with the 1s delay set up, the rest should become easily synchronized. Get creative by framing your fireworks with the surrounding buildings or capturing the city lights below the fireworks. Some places allow a nice effect of the fireworks reflections on the water.
Your final image can be processed on the computer in order to obtain more fireworks in one single picture: a merging process of more shots with no blending. (This is called double exposure technique)