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I'll explain the scenario here. I go out late at night to shoot star trails. The camera can't focus because it's too dark outside. If I put it on manual focus, the result is very blurred as the focus is not responsive.
If you are doing star trail or astro photography what you really want to do is focus on an "infinity" subject in the daytime using AF. Then switch to MF and tape the lens focus ring with gaffers tape so it can't move.
A less dependable option (only becasue you may not be able to find a subject) is at your photo location try and find a bright object like maybe a building in the distance. Focus, switch to manual and tape lens (or be careful not to touch focus ring).
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.