depth-of-field scale
/ˈdɛpθɒvfˈiːld ˈskeɪl/
n
中文：景深标尺
中文 · 景深标尺Español · escala de profundidad de campo de visiónFrançais · échelle de profondeur de champ
Meaning：Scale that shows the zone of sharpest focus around the subject; this is a function of the diaphragm’s opening and the distance between the lens and the subject.