The Blue Hour
Don’t you love that time at the beginning and end of each day when the light changes and everything looks magically transformed?
Outdoor photographers often use the terms “magic light” and “golden hour” to denote the special light when the sun is low in the sky and nearing the horizon — resulting in intense yellow and orange colors and providing a low directional spotlight that skims across the landscape, sculpting and defining the shape and texture of illuminated objects.
A serious photographer may even sit in one location for several hours waiting for that magic light, which typically begins to occur about one hour before sunset and lasts until sunset itself. In reality, the best magic light or golden “hour” may offer a window of only five to 10 minutes in which the magnificent evening light has its most artistic and visceral impact.
Oftentimes, photographers will take that last image just as the sun disappears on the horizon and then pack up the camera bag and head home. If they do that, they will miss a special opportunity that is only then beginning to present itself: The Blue Hour.
The evening Blue Hour begins roughly 10 to 15 minutes after sunset, or when the sun dips approximately 6 degrees below the horizon. This is the period of civil twilight in which the sky begins to take on a rich blue hue that gradually darkens as astronomical twilight comes on, eventually turning to the black night sky. The early minutes of Blue Hour are often great times to capture high clouds or mountaintops that still have some sunlight illuminating them, creating the visual vibrancy of warm colors against the cooler sky. It is also a prime time to photograph a rising full moon.
The later minutes of Blue Hour provide the best scenario for photographing city lights against the sky. Again, there is a small window of opportunity of only five to 10 minutes in which the deep blue sky provides the optimum background for the luminance of street, building and vehicle lights. For those photographers who enjoy using hand-held lights to paint buildings or other subjects with light, this is a great time to make the exposure.
Waiting any longer will result in a loss of the blue hues and a quick transition to the black night sky, which offers its own unique shooting opportunities — primarily celestial photography. Since night eventually turns to day, you also have a Blue Hour before the sun comes up in the morning. The same lighting conditions occur but in reverse, leading into the morning “golden hour.”
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