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Resolution of an ADC, Analog Digital Converter.
Problems when doing a readout from a DSLR camera.
Rounding errors, readout noise, limited dynamic.
Strong signal and overexpose problems.
Lowering the ISO setting to not overexpose.
Increase the ISO setting to detect weaker signals.
Detecting the weakest signals, half electrons? No!
Stacking images and increase the dynamic.
HDR with different exposure length or different ISO settings.
Background noise, narrow band, H-Alpha.
Increasing the number of images increase the signal to noise relations.
High dynamic data needs high bit software editing tools.
I hope this gave some explanation how to plan your night time photos for astronomy.