Zoom lens capable of focussing at close range

Details Zoom lens capable of focussing at close range Zoom lens capable of focussing at close range

1996-02-26

1998-06-02

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

057609683

ABSTRACT:
To provide a zoom lens in which focussing is possible with a small displacement and which is capable of close range focussing with superior imaging performance. The present invention provides a zoom lens capable of focussing at close range, of the type equipped with at least two lens units having negative refractive powers and arranged so as to be adjacent to each other, wherein focussing on close range objects is accomplished by causing one of the at least two lens units to move along the optical axis; and, the conditions:

REFERENCES:
patent: 5325233 (1994-06-01), Nakatsuji et al.
patent: 5499141 (1996-03-01), Ohtake
patent: 5515204 (1996-05-01), Usui et al.
patent: 5532881 (1996-07-01), Nakatsuji et al.

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