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

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

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