This was one of many shots I got from yesterday evening at the Legoland Fireworkds display.
The others can be seen here. http://www.facebook.com/home.php?#!/album.php?id=542234067&aid=260216
To get decent shots of fireworks you need to use a tripod and use "bulb" mode, and ideally a remote release. I only had a small tripod which is really for a compact camera vs a big bulky 40D but it worked OK.
Mount your camera on the tripod. Turn image stabilisation and auto focus off. Using IS on a tripod is not necessary and can even create negative results as the camera tries to remove shake that isn't there. You need to use manual focus as the light levels are so low auto won;t work and your lens will "hunt" trying to lock focus. Manually focus on a distant object and check againt hat your lens is set to manual focus.
Set the camera to manual (or bulb if you have that setting) and dial up the shutter speed to 30sec ... the next click after this should be BULB. This means that the shutter will remain open for as long as you keep the shutter release pressed down... this could be 1 second or 1 minute.
Set the aperture to a noimal value of f/8 and ISO to 100. If you press the shutter release now you'll get pretty much a black frame as light levels are so low but a firework will have anough light to give a good exposure.
Set the widest angle you can (ulktrawide zooms would give a great creative effect but the max I have in my lens is 17mm) and create a composition for where you think the fireworks will go off. Connect your shutter/cable release if you have one.
When the fireworks start to go off use the cable release to start and end the exposure. the longer you leave the shutter open the more light trails you'll get. Experiment with differnt times until you get an effect you are pleased with.
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