Sometimes the ambient light level is too low for successful for photography, or it’s the ‘wrong’ kind of light. This is where photographers turn to flash (or ‘strobe’, if you’re in the US). Flash works by emitting a very short, very powerful burst of light. Energy is stored in a capacitor in the flash head […]
This is a feature on more advanced external flashguns which lets you swivel and tilt the flash head in different directions, so that you can 'bounce' it off walls, ceilings, reflectors and other surfaces. This gives a much softer, more directional light than regular flash.