I took a few photos of the Poulsbo, WA fireworks display last night (July 3rd) experimenting with different camera settings.
Here’s the settings I used on this image:
F18 at 20 seconds, ISO 125, 75mm lens, Canon 5D MKII in AV mode. RAW file processed in Adobe Camera Raw. Several of my shots were set at F16 at 30 seconds, ISO 200 with good results. This photo was taken during the grand finale. With more fireworks happening at once I lowered the ISO to 125 and raised the aperture to F18. In AV mode the proper exposure was made in 20 seconds.