Manually focus to infinity..
Not the best recommendation as most lenses do not have a hard stop at infinity. That means it's possible to set the focus beyond infinity i.e. nothing is in focus.
OP > Learn about hyperfocal distance. It's a relationship between focal length and aperture that allows you to predict what will appear sharp in an image. It's useful because if you set the focus distance at or just beyond the hyperfocal distance for your given aperture, everything from half that distance to infinity should appear sharp. It's then a case of trying to make sure that most of your subject falls inside that range.
I have a self produced chart that lists the hyperfocal distance of my landscape lenses at the aperture and focal length I like to use. Typically 17mm, 24mm, 35mm, 50mm, 85mm and 135mm. from f4 to f16. Using Reikan focal, I not only have critical micro adjustment for each lens set, but also I know each lenses 'sweet' aperture. That way I try to keep within the sweet zone for each lens to get the best contrast & colour I can from my equipment.
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