As part of the Dark Skies Heritage Week in Ireland, I was asked to give a talk on DSLR Astrophotography. This lecture was recorded and is now on you tube https://www.youtube.com/watch?v=lPZlK5VP1yQ&t=1276s
I should point out that at 21:10 I said that going from f1.4 to f/4 is 4 stops. This is actually 3 stops, and the ISO needed to go to, to make up for the small aperture would be 6400, not 3200 that I mention.