The camera-toting physician from Calgary, Alberta, snapped “Going Down” on the Kananaskis River in the Canadian Rockies. “All the top canoeists and kayakers meet annually at the Kananaskis Whitewater Rodeo, but the action is so fast that it’s hard to get what you want, even with a motor-drive. You need a good vantage point and a lot of patience,” he says.

Camera: Nikon F90x; lens: 300mm; film: Fujichrome Provia 100