Meaning of the word "iris opening" in English

What does "iris opening" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

iris opening

US /ˈaɪrɪs ˈoʊpənɪŋ/
UK /ˈaɪrɪs ˈəʊpənɪŋ/

Noun

the adjustable opening in a camera lens that controls the amount of light reaching the film or sensor

Example:
Adjusting the iris opening is crucial for proper exposure in photography.
A wider iris opening allows more light to enter the camera.