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Im not 100% sure on the "sensitivity" difference of a CCD and a DSLR, but in the real world the cooling on most astronomical CCDs is what sets the two apart as Peter is alluding too. Sensitivity to me is how many electrons the sensor creates from a signal, and this may well be very similar between the two. The fact is that the noise level of DSLRs is far higher than CCDs, and thats before you take into account the bayer matrix and the ability to do narrowband imaging.
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