bouton de mise au point manuelle
/butˈɔ̃ də- ˈmiz o ˈpwɛ̃ manyˈɛl/
n
English: manual focusing knob · 手动调焦旋钮
Sens：Knob for manually adjusting the sharpness of the image projected on the screen.
English: manual focusing knob · 手动调焦旋钮