noun
iris-out
A film/video transition where the image closes from the edges into a circle, like an iris diaphragm. Technical term used in filmmaking and video editing.
その映画の最後はアイリスアウトで終わる。
The movie ends with an iris-out.
Fade-out gradually darkens the entire image, while iris-out closes from the edges into a circle.
Borrowed from English 'iris-out', a film transition term.