with movable lens means specially adapted for focusing at close distances

Full Title

Mountings, adjusting means, or light-tight connections, for optical elements > for lenses > with mechanism for focusing or varying magnification > by relative axial movement of several lenses, e.g. of varifocal objective lens > with movable lens means specially adapted for focusing at close distances

Classification Context

Section:

PHYSICS

Class:

OPTICS

Subclass:

OPTICAL ELEMENTS, SYSTEMS OR APPARATUS