Inner focusing zoom lens system

Details Inner focusing zoom lens system Inner focusing zoom lens system

1994-10-19

1996-06-18

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359684, 359686, G02B 1514

Patent

active

055284230

ABSTRACT:
The present invention relates to a zoom lens system used for photo-taking in a 35 mm single lens reflex camera. The zoom lens system consists of, from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. Zooming from a wide-angle side to a telephoto side takes place by moving all of the first lens unit through the fourth lens unit to the object side. Focusing on an object at a short distance is performed by moving the second lens unit to the object side.

REFERENCES:
patent: 4626076 (1986-12-01), Oshima et al.
patent: 4720180 (1988-01-01), Asano et al.
patent: 4906079 (1990-03-01), Mihara et al.
patent: 5134524 (1992-07-01), Hamano et al.
patent: 5144488 (1992-09-01), Endo et al.
patent: 5168402 (1992-12-01), Mihara
patent: 5337187 (1994-08-01), Fukino et al.
patent: 5347399 (1994-09-01), Yoneyama et al.

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