having a negative front lens or group of lenses

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 interdependent non-linearly related movements between one lens or lens group, and another lens or lens group > having a negative front lens or group of lenses

Classification Context

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