Patent ID: 8565589

Claim:
A zoom tracking controller, comprising: a first zoom lens; a first focus lens; a second zoom lens; a second focus lens; a lens position acquiring unit that acquires the position of the first zoom lens and the position of the first focus lens; a cam curve storage unit that stores at least one predetermined reference cam curve that represents a relationship among focused zoom lens positions and focus lens positions; a normalizing unit that carries out a normalizing process by which the acquired first zoom lens position and the acquired first focus lens position are normalized to a zoom lens position and a focus lens position on one of at least one reference cam curve according to a first cam curve, which is specific to the first zoom lens and the first focus lens, and to the reference cam curve; a focused lens position determining unit that determines the position of the second zoom lens and the position of the second focus lens on a second cam curve, which is a cam curve specific to the second zoom lens and the second focus lens, from the normalized zoom lens position and the normalized focus lens position according to the second cam curve and the reference cam curve; and a lens controller that respectively moves the second zoom lens and the second focus lens to the determined second zoom lens position and the determined second focus lens position.