| opt. |
variable power zoom lens; varifocal lens (whose focal length can be continuously varied over a specified range, providing a continuous range of magnification); zoom lens of variable focal length; vari-focus lens (by means of internal movement of the lens components with respect to each other these lenses can be changed in effective focal length and thus vary the linear magnification); variable magnification zoom objective; variable-power objective of the zoom type; zoom objective (the separation changes between the lens components yield a focal plane which is stationary or does not move outside the limits of depth of focus); zooming objective (the separation changes between the lens components yield a focal plane which is stationary or does not move outside the limits of depth of focus) |
