Blue hour is also the weekly topic for the Boost Your Photography: 52 Weeks Challenge. Consider joining the BYP 52 Weeks Google+ Community to share your weekly photograph and see what others are capturing.
When Is the Blue Hour?The Blue Hour is not always an hour, and it is not always blue. But, it is generally the time just following the sunset and Golden Hour or just before the sunrise and Golden Hour, and it most often lasts between an hour and only a half an hour. You can guesstimate the Blue Hour by adding about 15 minutes onto the sunset time (or subtracting 15 minutes from sunrise), or you can visit the Blue Hour Site, which has a handy Blue Hour calculator and will provide estimated starting and ending times for the Blue Hour. (There is also a link to a Flickr group with a lot of inspirational Blue Hour photographs.)
Shooting During the Blue HourMany of the same tips for Better Sunrises and Sunsets are also applicable to shooting during the Blue Hour, especially knowing when and where to shoot, creating foreground interest, and nailing the exposure. Think about bringing and using a tripod when shooting during the Blue Hour, as the fading light will have you wanting longer shutter speeds (read more about How to Maximize Your Tripod or a review of the GorillaPod line of travel tripods).
If you shoot in JPEG, you may want to adjust your white balance to "tungsten" when shooting during the Blue Hour, especially if you are shooting a city or other bright lights at night. Tungsten will deepen and accentuate the blue elements, often making for a more dramatic shot. If you shoot in RAW, you have the ability to choose Tungsten later in post-processing.
Keep an eye on your LCD and histogram when shooting during the Blue Hour, as the light will be changing rapidly. (See Demystifying the Histogram for more details on using your histogram.) One great strategy is to shoot bracketed shots using exposure compensation, which is available on most DSLR cameras. This allows you to shoot a series of photographs at varying exposure values, such as -1, 0, and 1, which is a good interval to use.
Comparing the three photographs above on the right, you can see how the underexposed shot (-1) brings out a deeper blue color in the sky when compared to the normally exposed (0) and overexposed (+1) images. This series was taken very early at the start of the Blue Hour, which is why the blue color is not as pronounced.
The left-hand series of three exposures was taken 15 minutes later, when the Blue Hour was in full swing. The deep blue skies are much more apparent across all three exposures. If you like the deeper, darker color, you might still prefer the underexposed version, but you might also find yourself drawn to the cheerier lighter blues of the normally exposed or overexposed versions too. This is the benefit of shooting bracketed shots: you can choose your favorites after the event, and you can always change your mind. As the Blue Hour rolls to an end and the sky becomes black, you might find that only the overexposed version retains any of the blue color.
Ideas for Blue Hour Subjects
Cityscapes. Cities are an ideal subject for Blur Hour photography. The bright lights and moving traffic create a great contrast to the changing blues of the night or early morning sky. In the photograph above, the frozen ice and water on the lake echo the brilliant blues of the sky. (The purples towards the bottom are from the light reflecting off the ice.)
Lights and Light Painting. Playing with lights is a particularly fun way to use the Blue Hour. You can use a flashlight to "paint" color or brightness onto a subject, or you can write, paint, draw or swirl with lights to create intricate patterns and designs. All of them are complemented by the blue tones of the Blue Hour. Read Light Painting: How to Spin an Orb for more specifics.
Fairs, Festivals, and Carnivals. Anywhere with bright carnival rides is a great location for Blue Hour photography. After the sun sets and the blue hues come out, you can capture incredible long exposure shots using your camera, tripod, and remote shutter release. Vary your shutter speed, angle, and timing to create a wide variety of photographs. The photographs above show the difference between shooting during the Blue Hour and shooting after. The second shot was taken about a half-an-hour after the first. The blue color really adds to the brightness and drama compared to the black.
Sparklers, Fireworks, and Steel Wool. You can also create amazing Blue Hour photographs with sparklers, fireworks, or steel wool. Again, the bright lights look even more amazing against a blue backdrop. Sadly, not all communities schedule the timing of their fireworks displays around the precise Blue Hour (how thoughtless!), but you can choose the time if you are using sparklers or steel wool. Read more about Spinning Fire and Steel Wool Photography and/or Quick Tips for Better Fireworks Photographs for more details.