Thanks to some detective work from one of our readers (Ivo Schenk) we have now confirmed that Sony does indeed have a 1/1.8" 4 megapixel CCD, it is product name ICX406AQ and has an effective output resolution of 2,312 x 1,720 pixels (3.9 megapixels). So, could this be the illusive sensor used in the rumoured "DSC-S85"? Only time will tell, however this sensor would offer manufacturers of existing 3 megapixel digital cameras an immediate path to 4 megapixels without having to change the cameras (or lens systems) significantly.