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One thing not covered here is well depth too. DSLRs tend to have a lower well depth than dedicated astrophotography cameras ( unless it’s a high end DSLR or a low end astro camera ). This means that after a certain amount of time the pixels picking up bright objects, eg. stars, will be “ full “. This means they appear to be pure white and contain no colour definition. This is called white clipping. You can obviously extend this time by reducing your ISO but then as has been stated by the others, your thermal noise will take over your signal. It’s all a balancing act but I think one that makes this hobby so interesting. We all have our different ways of tackling the challenges.
Cheers
Ryan
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