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

1.
foquista, primer asistente de cámara
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.
El foquista ajustó meticulosamente el objetivo mientras el actor caminaba hacia la cámara.
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A good focus puller is essential for sharp, professional-looking footage.
Un buen foquista es esencial para obtener imágenes nítidas y de aspecto profesional.