Optical: systems and elements – Lens – With variable magnification
Patent
1994-06-27
1996-07-02
Epps, Georgia Y.
Optical: systems and elements
Lens
With variable magnification
359683, G02B 1514
Patent
active
055328814
ABSTRACT:
A zoom lens of five group construction utilizing an inner focus system. The zoom lens includes a first lens group G1 having a positive refracting power, a second lens group G2 having a negative refracting power, a third lens group G3 having a negative refracting power, a fourth lens group G4 having a positive refracting power and a fifth lens group G5 having a negative refracting power, which are arranged in this order from an object side, and the distances among the respective lens groups are selectively varied to effect the desired zooming operation. During close-up photographing, the second lens group G2 is moved along an optical axis to effect the desired focusing.
REFERENCES:
patent: 3482900 (1969-12-01), Wagner
patent: 5189557 (1993-02-01), Endo
patent: 5325233 (1994-06-01), Nakatsuji et al.
Nakatsuji Masahiro
Suzuki Kenzaburo
Epps Georgia Y.
Nikon Corporation
Papalas Michael A.
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