Term

Zoom

1) To move quickly. 2) To change smoothly the magnification of an electronic or optical image by enlarging or reducing it.

1886, of echoic origin. Gained popularity c.1917 as aviators began to use it; zoom lens is 1936

Term

Zoom lens

An optical system of variable focal length with the focal plane remaining in a fixed position. Some components are moved while others remain stationary.