Phase One IQ2 digital backs: http://www.phaseone.com/IQ2 Test drive Phase One: http://www.phaseone.com/demo The new IQ260 and IQ280 models have a new feature called Black Calibration. Once activated, it helps produce lower noise levels in dark sections of an image. This is particularly noticeable in shadow areas that have been shot at a high ISO. To switch this function on, tap Menu on the home screen and scroll down to Black Calibration. You'll see the default setting is Normal. Tap Extended and you'll automatically be returned to the main menu list. We recommend this for photography where a quick burst rate is not critical as this mode will occasionally add extra black calibration time between captures. Try Phase One: http://www.phaseone.com/demosignup Download Capture One: http://www.phaseone.com/download