Taking photographs of fireworks with a manual camera is actually fairly easy. Set your camera on the bulb setting (which keeps the shutter open as long as you want it open) and hold a dark piece of cardboard over the lens. When you anticipate a burst of fireworks, take away the cardboard, then put it back over the lens. Do the same thing a few times. Click the shutter to end the exposure, and then repeat the sequence with different frames.
