Canon has developed what was everybody thought to be impossible. And while it might not be the highest resolution camera sensor out there, Canon’s new 1-megapixel Single Photon Avalanche Detection (SPAD) sensor offers some huge benefits over more traditional CMOS or CCD sensors. The biggest being that it all but eliminates noise from your images.
It differs from CMOS sensors in the way that it captures light. Whereas CMOS sensors use electrical signals to monitor the volume of light hitting each pixel in an analogue fashion, which introduces noise, before being converted to digital, SPAD sensors count each and every individual photon that hits it and puts out a true digital signal.