A flash adds light where the natural light falls short — in a dim room, against the light, or to freeze fast movement. Flashes differ in power, measured as guide number, and also in whether the head tilts and whether the flash sets its own output by talking to the camera or has to be set by hand. The flash foot has to match the camera's mounting shoe, as manufacturers do this differently.
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A flash adds light where the natural light falls short — in a dim room, against the light, or to freeze fast movement. Flashes differ in power, measured as guide number, and also in whether the head tilts and whether the flash sets its own output by talking to the camera or has to be set by hand. The flash foot has to match the camera's mounting shoe, as manufacturers do this differently.