THE STAFF, NEW YORK INSTITUTE OF PHOTOGRAPHY:
"A skyrocket takes time from the moment it's launched until the last burst of its color fades. As the rocket sails skyward, the crowd has time to exclaim 'Ooh!' Then as it explodes in a burst of trails of color, the crowd has time to exclaim, 'Ahh!' From launch to fadeout takes a few seconds perhaps ending with a stirring 'bang.' Your exposure, therefore, should be long enough to capture part, or all, of this time-consuming progression."