Most camera manufacturers have incorporated autofocus assist beam into the camera to help it to focus in a low lit light condition. It is usually found on top of the len barrel and usually emits either an infrared light or a visible light with range usually up to 4 metres. For an external flash which can be mounted on top of the camera hotshoe, the range is usually long (Up to 16m). The AF assists beam can sometimes be double up as a red eyes reduction system by firing a strong light to allow the pupils to contract to reduce red eyes.
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