Light painting is a photographic technique in which exposures are made by moving a hand-held light source or by moving the camera. The term light painting also encompasses images lit from outside the frame with hand-held light sources.
Camera painting might be thought of as light painting in reverse. With light painting the camera is usually steady or on a tripod and light, such as a flashlight, is then waved, painted and drawn in the air. While with camera-painting, however, the camera moves across lights that are usually stationary. Your particular type of camera movement results in patterns or lines that create an abstract composition.
Digital photography makes it easy to 'camera-paint'. You move your camera to paint lights -- which is not just a phrase, it is exactly what you will be doing. It's a lot of fun and really exciting when you get a colorful composition.
A variety of light sources can be used, ranging from simple flashlights to dedicated devices like the Hosemaster, which uses a fiber optic light pen.Other sources of light including candles, matches, fireworks, lighter flints, glowsticks, and Poi are also popular.
A tripod is usually necessary due to the long exposure times involved. Alternatively, the camera may be placed on or braced against a table or other solid support. A shutter release cable or self timer is generally employed in order to minimize camera shake. Color Gels can also be used to color the light sources.
Source:Wikipedia
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