lens aperture scale
/ˈlɛnz ˈapətʃə ˈskeɪl/
n
English · lens aperture scale中文 · 光圈刻度Español · escala de abertura del diafragmaFrançais · échelle d’ouverture de diaphragme
意味：Graduated scale that controls the diaphragm’s opening; it is measured in f-stops and a high f-stop indicates a small opening.