Pre-PMA 2008: Too many grumpy facial expressions in your family snaps? Do not despair! Sony has today announced 4 new models in its W-series of digital compact cameras, all of which are featuring Sony's 'smile shutter' mode. When set to this shooting mode the camera automatically releases the shutter when the subject smiles. The DSC-W170 and DSC-W150 (available in April) sport a 5x Carl Zeiss Vario Tessar lens while the smaller sister models DSC-W130 and DSC-W120 (available in March) come with a 4x zoom. All cameras will be offered in a range of colors.