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Hi Leo,
As Leon says, you can use AF during the day and it does work. As an alternative to keep good focus through the night as temps change is to use something illuminated near by.
Short focal length lenses have a very short hyperfocal distance (infinity) of a few metres, so using an object 30 to 50 metres away will get you good focus. I've used street lights, signs, illuminated windows & even the tail lights of my car at dark sites. Use AF to get focus then switch to manual & alls good.
Cheers,
Mark
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