This is the link to Peter Burke's Power Point presentation on Astro and night photography.

http://adelaidecameraclub.org.au/Peter%20Burke%20pdf/2020%20-%20Arcoona%20Studios%20-%20Night%20&%20Astro%20Photography%20V2.1.pdf

If you are using Google Chrome and only the first page opens, then you need to add the "PDF Viewer" Extension to your Chrome browser. Here is the link. It is free.

https://chrome.google.com/webstore/detail/pdf-viewer/oemmndcbldboiebfnladdacbdfmadadm?hl=en