Zoom lens of the internal focus type

Details Zoom lens of the internal focus type Zoom lens of the internal focus type

1990-12-21

1992-08-04

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359687, 359688, G02B 1514

Patent

active

051364310

ABSTRACT:
A zoom lens is disclosed comprising a front lens unit, an intermediate lens unit having two lens sub-units with their axial separation varying for zooming purposes, and a rear lens unit, wherein at the wide-angle end, focusing is performed by moving at least the rear lens unit, and, at the telephoto end, focusing is performed by moving the intermediate lens unit and the rear lens unit, whereby the amount of focusing movement of the intermediate lens unit from an infinitely distant object to an object at a certain short distance is greater at the telephoto end than at the wide-angled end.

REFERENCES:
patent: 4052372 (1977-10-01), Schroeder
patent: 4702567 (1987-10-01), Kato et al.

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