échelle d’ouverture
/kɔ̃pɑ̃satˈœʁ də- pusˈe lateʁˈal/
n
English: aperture scale · 光圈刻度
Sens：Graduated scale that shows the diaphragm’s opening measured in f-stops (a high f-stop indicates a small opening).
English: aperture scale · 光圈刻度