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Perhaps the possible array size is quite small, they dont seem to mention anywhere the sizes possible, or its very expensive.
Ive been wondering about this. 100% QE is one photon=1 electron, so electron muliplication would just improve S/N ratio, which is significant as it would also increase dynamic range. But with the likes of us taking long exposures on typical brighter astro objects and cooling, perhaps the S/N improvement would mainly suit pros taking very short exposures with very large apatures to enable AO operation as described in the Lucky cam site.
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