The point of bias frames is what you take them without accumulating any charge. Well yes, you cannot eliminate random noise, but you can reduce it. Also, most p

The point of bias frames is what you take them without accumulating any charge. Well yes, you cannot eliminate random noise, but you can reduce it. Also, most popular deidcated astrophotography cameras are now CMOS not CCD and readout differs in these. Your link does not work, and probably for the better. See this instead: https://www.youtube.com/watch?v=O6oGyFlZgAc https://www.youtube.com/watch?v=O6oGyFlZgAc