Part 4 of 4
I saved zooming while taking long exposures because it is probably the hardest one of this series. Let's start with the settings and sticking with modifying only the shutter speed the same we did on ICM and ECM to 5 seconds. The amount of time depends on how smoothly you can move your zoom without adding too much additional shake.
The idea on this one is to move your zoom from its longest to its shortest, shortest to longest, or some amount that you desire. An 18-35mm works great, but I love using my 24-70 and 70-200 mm lenses.
There is one option I have not mentioned until now and that is using bulb mode. Bulb mode is used when you want to control how long to keep the shutter open and be able to close it when you are ready. I highly recommend a tethered remote trigger or an electronic switch. With the remote trigger and bulb mode, you control when the "end" of the exposure is. You will also want to shut off the shutter timer if you had it on for the standard firework shots.
Update on 6/17:
Once I made my Youtube version of this blog post I realized that none of my zooming photos use a remote trigger and also stuck to bulb mode. Writing how I do these fireworks photos made me think hard about how to do these shots. I will ve writing a review/summary of these four posts and provide a "cheat" sheet to help have successful firework photos.
Part 4: How to take Zooming Photo Shots with Fireworks