Zoom lens system

Details Zoom lens system Zoom lens system

1996-09-13

1998-03-31

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359645, 359716, 359399, 359422, 354222, G02B 1514, G02B 2500, G02B 2300, G02B 1310

Patent

active

057345090

ABSTRACT:
A zoom lens system is composed of three lens groups. Arranged in the order from an eyepoint side are a first lens group G.sub.1 having a positive refracting power, a second lens group G.sub.2 having a positive refracting power and movable along an optical axis during the period of zooming, and a third lens group G.sub.3 having a negative refracting power and movable along the optical axis during the period of zooming. In the second lens group G.sub.2, at least one positive lens includes a lens surface composed of an aspheric surface at least on one of its eyepoint side and object side. Not only a sufficient eye relief is ensured but also various aberrations are corrected throughout the whole zooming range.

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