Zoom camera lens having three moving groups

Details Zoom camera lens having three moving groups Zoom camera lens having three moving groups

1993-11-30

1995-10-24

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359695, G02B 1514

Patent

active

054615127

ABSTRACT:
A zoom camera lens which is particularly compact, has a small number of elements and is capable of good performance at relatively wide aperture has a front negative lens group, a middle positive lens group and a rear negative lens group. The rear negative lens group has a focal length not more than 1.25 times the focal length of the middle positive lens group. Preferably, the lens has seven or eight elements and is designed without the use of aspheres.

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patent: 5218477 (1993-06-01), Ito
patent: 5274504 (1993-12-01), Itoh
patent: 5371631 (1994-12-01), Takada

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