by relative axial movement of several lenses, e.g. of varifocal objective lens

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

Child Classifications

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• G02B 7/102
• G02B 7/105 with movable lens means specially adapted for focusing at close distances