Auto Focus Illuminator let's you set the right focus in poor light circumstances. The camera detects whether there is too little light, pushing the shutter button half way down, the camera will shine a red light on the subject and when you push the shutter button completely down, the flash will go off. Result; a well focussed picture in poor lâ€¦
(Auto Focus) The Auto Focus Illuminator is a low-power red-light source used to give sufficient illumination for the camera to carry out automatic focusing under poor light conditions.
Found on http://www.sony.co.uk/glossary/ShowGlossary.action?site=odw_en_GB§ionty
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