the biggest feature of p>M9 is that it is equipped with a full-size CCD sensor of 36x24mm, with an effective pixel of 18 million and a pixel spacing of 6.8x6.8 microns. It is particularly noteworthy that this CCD sensor does not have a low-pass filter. Therefore, it will have excellent color performance at low sensitivity. In fact, it has always been a patent of Kodak SLR cameras without low-pass filters. Obviously, Leica's M9, like M8, uses Kodak's CCD sensor.
in order to meet the huge calculation requirements of full-frame models, Leica specially used dual image engines for M9, which fully doubled the processing capacity compared with M8. In terms of sensitivity, M9 supports the sensitivity of ISO 16-25, and can extend the ultra-low sensitivity of ISO 8.