having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group

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 interdependent non-linearly related movements between one lens or lens group, and another lens or lens group > having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group

Classification Context

Section:

PHYSICS

Class:

OPTICS

Subclass:

OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

Child Classifications

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• G02B 15/167 having an additional fixed front lens or group of lenses