arranged + ––

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 > arranged + ––

Classification Context

Section:

PHYSICS

Class:

OPTICS

Subclass:

OPTICAL ELEMENTS, SYSTEMS OR APPARATUS