vérification de la profondeur de champ
/veʁifikasjˈɔ̃ də- la- pʁofɔ̃dˈœʁ də- ˈʃɑ̃/
n
English: depth-of-field preview button · 景深预览按钮
English · depth-of-field preview button中文 · 景深预览按钮Español · botón de previsionado de profundidad de campo
Sens：Button that closes the diaphragm so that the relative clarity of various depths can be seen through the viewfinder.