PICTURES WITH A LEG (OR LEGS) TO STAND ON
By MICHAEL PERKINS
YOU HAVE SEEN THEM A MILLION TIMES. Those brave souls who, despite multiple trips to Failed Fotoland, optimistically point their cel cameras at distant and dark objects, hoping their puny on-board flashes will illuminate cavernous concert halls, banish shadows from vast cathedrals, or, God bless them, turn the night sky into a luminous planetarium. They have faith, these people. But they don’t often take home the prize.
Immense, dark masses of subject matter, from mountain sides to moody urban streets, simply cannot be uniformly exposed with a sudden lucky burst of on-camera flash. The only way to gather enough light to get a usable exposure of such things is to leave your shutter open long enough to let more light soak in. Think dribble instead of flood. Time exposures are remarkably effective in “burning in” an image slowly, but they have their own science and technique, and they must be patiently practiced. They are the dead opposite of a quick fix, but they are worth the trouble.
With today’s editing software, it’s easier than ever to customize even your best time exposures, combining several shots taken over a given time sequence to arrive at a satisfying balance of elements. In the above picture, I wanted to show the colorful “Field Of Light” installation created by artist Bruce Munro for Phoenix’ Desert Botanical Garden, which blankets a desert hillside with over 30,000 globes of color-shifting light. I set up my tripod about a half-hour before local sunset and took exposures five minutes apart until about forty minutes into the onset of evening.
From that broad sequence, I selected two frames; one taken before dark, in which the underlying detail of the hill (desert plants, rocks, etc.) could still be seen, and one taken just after the sky had gone dark to the naked eye, but blue to the camera. I then composited the shots in Photomatix’ “exposure fusion” mode, which is a bit like stacking two backlit slides and gradually changing how much of each can bleed into the other. My object was to get both a blue, but not black, twilight sky and at least some detail from the natural terrain. Neither individual shot could achieve all of this alone, however, given the ease of doing an exposure fusion in nearly any kind of photo software these days, it was a snap to grab the best elements of both frames.
Epilogue: during the fairly long stretch of time I was standing behind my tripod, I counted over two dozen separate visitors who boldly stepped up, aimed their cellphones, cranked off a quick flash, and loped away, muttering something like, “well, that didn’t work.” Some shots are like low-lying fruit, and some have to be coaxed out of the camera. Knowing which is which, ahead of time, makes for happier results.
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