Variable Focus Lens
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VARIABLE FOCUS LENS - A zoom lens - one in which focal length is variable. Elements inside a variable focus lens shift their positions, enabling the lens to change its focal length - in effect, providing one lens that has many focal lengths.
Variable focus lens.
Lens of which the focal length can be continuously varied between set limits. The lens must be refocused with each change in focal length.
Viewfinder. ...
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. (Also called a "Variable focus lens.")
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 See also: Focal, Focus, Focal length, Lens, Exposure
  
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