This is the application of depth of focus.

在摄影中总是不能娴熟地加以运用。

youdao

Focus: plane of focus; focal length; and depth of field.

焦距：焦点平面，焦距和景深。

youdao

Focus: plane of focus; focal length; and depth of field.

焦距：焦点平面，焦距和景深。

youdao