Medium - How to focus at night (hyperfocal)

Hello again, and sorry by not posting anything for a long time, I've been a bit busy with University stuff and other projects.

I'll talk about how I use the hyperfocal rule, which is very useful, especially shooting in low light conditions, like in the night. You'll need a lantern and a camera. And it'd be great if you had an smartphone, you'll find out why if you continue reading.

The hyperfocal rule serves to calculate at which distance we should focus to make not only the foreground subject appear focused (whatever: a house, a tree, etc), but the background as well (the infinite point focused, so that stars, for example, appear focused too). This distance will depend on many factors: the aperture, the focal lenght, the circle of confusion, etc. But fortunately this won't be a maths class: you can download apps for your smartphone or find on the internet hyperfocal distances for your camera depending on these factors, so that you'll have to calculate nothing. I use an app and I only have to put the focal lenght, the camera I'm using and the aperture value, and I'll get the hyperfocal distance.

What do I do after the app calculates this distance? Easy!, I place myself with a lantern in front of the camera at (more or less) that distance, and I focus to the lantern. And that's all, my scene will appear focused, both in foreground and background/infinite point.