Zoom lens and magnifier utilizing the same

Details Zoom lens and magnifier utilizing the same Zoom lens and magnifier utilizing the same

1994-07-22

1997-12-30

Nelms, David C.

Optical: systems and elements

Lens

With viewed object or viewed field illumination

359676, 359689, 359698, G02B 2702, G02B 1514

Patent

active

057037272

ABSTRACT:
A zoom lens is described which is quite simple and yet provides a wide (5:1) zoom range. The lens consists of a front focusing negative lens which provides a stationary virtual image for two rear zooming lens groups. These two zooming groups are positive and reimage the object at a camera pickup device. Such zooming groups are of substantially equal focal length and bear equally in the magnification change. The invention includes a magnifier which utilizes the zoom lens and has the mechanical aspects necessary to provide the needed lens motions.

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