Extreme action is the mark of photographer Colin Meagher, who captured whitewater kayaker Chuck Kern cresting the falls on the Kootenai River in Northwest Montana. Like his subjects, says Meagher, "I find that I am drawn to things that have a lot of high-energy. Whether it's running or climbing, mountain biking or snowboarding, I'm looking for that little slice of time that most people aren't even aware of."

It's on those occasions, Meagher says, that having a motor drive is one of the nicest luxuries. "It allows me to anticipate that moment, but often times, I won't even have the motor drive running. I'll just be clicking one frame at a time. Just to keep sharp...