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A flashgun is a device that you can attach to, or that is part of, a camera. It makes bright flashes of light so that you can take photographs indoors. (摄影)闪光枪
The SIGMA DP3 Merrill is equipped with a hot shoe, allowing use of the dedicated external flashgun EF-140 DG (optional) as well as SIGMA electronic flashguns for SD series such as EF-610 DG Super (optional) and EF-610 DG ST (optional).