闪光灯

Main features: Flash is also one way to strengthen exposure, especially in dark places. Flash can make the scene brighter.Meanwhile there are also disadvantages ofthe use of flash.The light may ramain in the pupil and to cause 'the red eye'. Therefore the camera makers are add 'eliminate red eye' to the design,that is give out weak light before the flash was started to let the pupil adapt to the light ,and the real flash is just come follow it to avoid the red eye.