Focus Pulling For Fireworks
One of my most favorite techniques for photographing fireworks is focus pulling. I love how it makes the fireworks look like flowers or sea creatures.
So this requires some skill and pre-planning so you know what you are doing during the light show.
Camera should be in bulb mode
You will hold the shutter open for 1-2 seconds
Lens should be in manual focus
Press the shutter button when you first see the firework
Start out of focus and turn your ring on your lens to infinity until you are in focus with the shutter open
You can play around with aperture and starting in focus and moving out as well.