You are completely right mcdeltat. The problem with writing content is that without feedback it is easy to forget or miss something, even if it appears to be very obvious to you sometimes it is just too easy to miss. A webpage needs to be constantly updated.

I am very happy with your comments and will use them to update and improve the page. On the website as a whole I have all the things you talk about including an exposure calculator: https://astroimagery.com/techniques/imaging/astrophotography...

Of course, it is not perfect. Nothing can be but it is a good starting point and I tried to base it on real experience and some research.

The wrong words yes for RAW files: they appear black and lifeless but contain a rich amount of detail which requires stretching and the rest.