Dr. Alexandre Santerne 🌍 (alexsanterne@astrodon.social)'s status on Sunday, 18-Dec-2022 23:45:38 JST

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The way I proceed is the following:
1- set up the camera during twilight (before it is dark)
2- point you camera the way you like making sure your camera is perfectly horizontal
3- do the focus (can use auto-focus since it's still bright)
4- put the camera in mode BULB
5- turn OFF the auto-focus and do not touch anymore the lens focus.
6- set the camera sensitivity (up to 6400ISO with my 5DIII)
7- set up the intervalometer
8- come back when it's dark
9- start the sequence
10- wait for long