>>4066037Astrofags shoot long exposures of shit that doesn't move, which you realistically can do with a small sensor webcam. Wildlife photographers shoot shit that moves a lot and fast. That's why wildlife photographers need the best possible ISO performance. If medium format cameras weren't so slow I'm sure they would use those instead.
That said, astrofags do not typically use webcams, they use dedicated astronomy cameras with their own set of tradeoffs tailored to their specific use case.