Highlights

Lenses with f1.4 and f 2.8 are fast lenses.

Night photography requires fast lenses.

Prompts

Aperture is the hole in the lens where light enters and travels into the camera sensor.

In the human eye, aperture could be represented by the pupil.

The camera lens' diaphragm controls the size of the aperture.

In the human eye, the camera lens' diaphragm could be represented by the iris.

Why does a larger f-stop number translate to a smaller aperture? :: The f-stop number represents the size of the diaphragm blocking light into the lens.

Why is the max aperture size of a lens more important than the minimum aperture size? :: It determines the lens' speed.

Why should you avoid large f-stop numbers? :: Leads to diffraction that blurs images.

A prime lens has a fixed max aperture.

The max aperture of a zoom lens will get smaller as the focal length increases.

The f-stop number of a camera using a zoom lens will increase as the focal length increases.

When you zoom in with your camera, focal length increases.

References

Camera Basics - Aperture. Directed by Apalapse, 2017. YouTube, https://www.youtube.com/watch?v=YojL7UQTVhc.