Excellent advise from all. F/8 should be perfect. Using a larger aperture will make the lines of the bursts thicker, using a smaller aperture will thin them out a bit. Of course, aperture is also somewhat dependent on your chosen focal length.
Remember, if the sky is really dark, there is (very) little exposure done until the burst fills the sky, so if you open the shutter as the burst is launched, it should work out fine. Use a tripod, not a monopod.
One advantage of the G12 is that you can see (more or less) what bursts are in your frame by looking through the viewfinder during the exposure time! (can't even do that with an SLR!)
Fenka856 wrote in post #14648005
At what point do I press the shutter? When the fireworks launches or at the time it explodes?