> It doesn't really matter how many small-arrays you point at one target because it's the SNR at the individual detector-sites that matters. This is quite inc

> It doesn't really matter how many small-arrays you point at one target because it's the SNR at the individual detector-sites that matters. This is quite incorrect. Detector noise is a combination of thermal/electrical/quantum effects and is essentially decorrelated. The image information captured by the sensors is not. That means that taking the mean of N images improves the SNR by sqrt(N). You can do this over time (and deal with motion artifacts) or you can do this by using multiple detectors at the same time. There is a physical limit of how many large detectors you can fit inside the physical body of a DSLR. At some point, it will more efficient to combine multiple smaller detectors instead.