focus puller
US /ˈfoʊkəs ˌpʊlər/
UK /ˈfoʊkəs ˌpʊlər/

1.
fuochista, primo assistente operatore
a member of a film crew who is responsible for adjusting the camera's focus during filming, ensuring that the subject remains sharp and clear as the camera or subject moves
:
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The focus puller meticulously adjusted the lens as the actor walked towards the camera.
Il fuochista ha regolato meticolosamente l'obiettivo mentre l'attore camminava verso la telecamera.
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A good focus puller is essential for sharp, professional-looking footage.
Un buon fuochista è essenziale per riprese nitide e dall'aspetto professionale.