When a photographer clicks a shutter, he lets in the light. It zips into the camera faster than we can comprehend, at 186,000 miles a second, or about 670 million miles per hour. But the image it leaves — much less the story it tells — can be indelible. We collected some of the memorable photographs taken by Scott Elmquist and Ash Daniel in 2010, and asked them to tell us about the moments they captured that are both fleeting and lasting.