having a front fixed lens or lens group and two movable lenses or lens groups in front of a fixed lens or lens group

Introduced: January 1985

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 > with movable lens means specially adapted for focusing at close distances > having a front fixed lens or lens group and two movable lenses or lens groups in front of a fixed lens or lens group

Classification Context

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

2 direct subcodes

Child Classifications

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G02B 15/26 arranged + ––
G02B 15/28 arranged + – +