In January 2015, two world-class rock climbers achieved a first for their sport: a free ascent of the Dawn Wall of El Capitan in Yosemite National Park. The news of Tommy Caldwell and Kevin Jorgeson’s ascent captivated a global audience, largely thanks to the stunning imagery that was being captured live from the side of the 3,000-foot monolith. Corey Rich was one of the photographers who spent 10 days living on the side of El Cap with his friends as he documented their historic ascent. In this Tech Tip from Adorama, Rich discusses one of the biggest challenges he faced during the climb: shooting the climbers as they climbed by headlamp at night.