Zoom lens system

Details Zoom lens system Zoom lens system

1990-12-20

1991-12-17

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

G02B 15177

Patent

active

050730150

ABSTRACT:
A zoom lens system having a negative lens group which includes a negative lens having a concave surface facing the reducing side and a positive lens having a convex surface facing the enlarging side, and a positive lens group which includes a positive lens unit of at least one positive lens having a convex surface facing the enlarging side, a first lens having a concave surface facing the reducing side, a double convex lens, and a second lens having a concave surface facing the enlarging side, and wherein said zoom lens system is standardized by the conditional expression so that the pupil position on the reducing side approaches the image point on the reducing side.

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