La bascule de point, quèsaco ?
4'44' - (en anglais) La bascule de point, c'est-à-dire le changement
de mise au point au cours d'une même prise de vue vidéo (rack
focusing, en anglais), est une astuce très prisée par certains
réalisateurs. Explications...
bascule de point défini dans Télérama
Origin of term rack:
This CENTURY CAMERA, Model No. 16 was manufactured by the Century Camera Company from approximately 1900 to 1902. It was constructed of solid mahogany with dovetail workmanship and covered in cowhide leather. It featured a double extension mahogany bed, attached with piano hinge for stability. The brass hardware is highly polished and lacquered. Focusing was adjusted by a duel rack and pinion adjustment, with a long extension bellows.
prentis drews vintage camera collection
Rack and pinion are the terms that describe a gear assembly.
As seen here: rack and pinion gears_animation