They do that with a conventional camera by opening up the aperture of the lens and selecting a faster shutter speed.

ECONOMIST: Tech.view: Me no Leica any more | The

It features a 1.2MP front camera for video conferencing and an 8MP rear camera with a large F2.2 aperture, 5-element lens allows for high quality images along with HD video recording.

ENGADGET: ASUS rebrands its tablets 'Transformer Pads,' announces the high-end Infinity Series with either Tegra 3 or Snapdragon's S4 chip

The Transformer Pad Infinity has a 2MP front camera for HD video conferencing along with an 8MP rear camera with a large F2.2 aperture, 5-element lens and LED flash for stunning high quality images or HD video capture.

ENGADGET: ASUS rebrands its tablets 'Transformer Pads,' announces the high-end Infinity Series with either Tegra 3 or Snapdragon's S4 chip