A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Zone System - A method introduced by photographer, Ansel Adams, for determining optimal exposure and appropriate development for an individual photograph.

Zoom lens - A lens of variable focal length. For example, in an 80-2OOmm zoom lens, the focal length can be changed anywhere between the lower limit of 80mm and the upper of 200mm. This affects the scale of the image on which the lens is focused without throwing the image out of focus.