escala de abertura del diafragma
/eskˈala ðe ˌaβeɾtˈuɾa ðel ðjafɾˈaɡma/
n
English: lens aperture scale · 光圈刻度
Significado：Graduated scale that controls the diaphragm’s opening; it is measured in f-stops and a high f-stop indicates a small opening.