Fireworks have long been a favorite subject for photographing. The colors and shapes created are infinitely varied. Then I learned how zooming the focus ring during the exposure creates even more fun! (Check out this article on Photo Cascadia's blog by Sean Bagshaw http://bit.ly/2IeTALa; also this Flickr post by Allyeska http://bit.ly/2Kpp0B4) Of course, Scott Kelby has a great article every year on the basics of photographing fireworks: https://scottkelby.com/take-awesome-photos-fireworks/