Rear focusing zoom lens

Details Rear focusing zoom lens Rear focusing zoom lens

1995-06-07

1998-12-08

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359676, 359683, G02B 1514

Patent

active

058478825

ABSTRACT:
A zoom lens having a first lens unit remaining stationary and having positive refracting power, a second lens unit having negative refracting power, a third lens unit having positive refracting power, a fourth lens unit having negative refracting power and a fifth lens unit remaining stationary and having positive refracting power to perform zooming by moving at least the second lens unit and the fourth lens unit and to perform focusing an infinite object to a nearest object by moving the fourth lens unit toward the image surface.

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patent: 5111338 (1992-05-01), Nakayama
patent: 5113287 (1992-05-01), Nakayama
patent: 5388004 (1995-02-01), Adachi
patent: 5659426 (1997-08-01), Aoki

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