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"Z" terms

"Zone system" to "Zoom lens"

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ZLR - Zoom lens reflex camera (see below)

ZONE SYSTEM - A method introduced by photographer Ansel Adams for determining optimal exposure and appropriate development for an individual photograph.

ZOOM - The action of varying the focal length of a zoom lens to enlarge (zoom in) or reduce (zoom out) the image.

Nikon's AF-S VR Zoom-Nikkor 70-200mm f/2 is a zoom lens.
Nikon's AF-S VR Zoom-Nikkor 70-200mm f/2 is a zoom lens.

ZOOM LENS -Also called a "Variable focus lens." A lens in which focal length is variable. Elements inside a zoom lens shift their positions, enabling the lens to change its focal length - in effect, providing one lens that has many focal lengths within a given range - e.g. 70mm to 200mm (as illustrated by the lens shown above).

ZOOM LENS REFLEX camera - Also known as a ZLR camera. A prosumer camera that has advanced features that are similar to an SLR (Single Lens Reflex) camera, but has a permanently fixed zoom lens instead of the ability to interchange lenses.