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Thanks Colin. But that still does not clarify for me why does one need to stack so many more subs with the CMOS chip, if dynamic range per sub is the same as in a CCD? ICX 834 and ICX 814 both have smaller pixels than the 1600 (and shallow wells), but one can expose for much longer and fewer subs are needed to achieve the same level of detail in astrophotos. That's why my intuition tells me that dynamic range per sub must be lower in the 1600.
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