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I know there are some nay-sayers around here, but looking at their published specs gain 100 is a no-brainer.
Imagine the noise as an error bar. The significant reduction in the size of the error bar when the HCG kicks in is enough to push the dynamic range back up to near maximum.
For the same total exposure time, the SNR of the end result will be higher at gain 100 than gain 0.
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