by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Introduced: September 1968

Last revised: January 2006

Full Title

Optical objectives with means for varying the magnification > by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective

Classification Context

Section:: PHYSICS
Class:: OPTICS
Subclass:: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

3 direct subcodes

Child Classifications

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G02B 15/15 compensation by means of only one movement or by means of only linearly related movements, e.g. optical compensation
G02B 15/16 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
G02B 15/22 with movable lens means specially adapted for focusing at close distances