Wide-angle, high-zoom-ratio zoom lens
AssigneeOlympus Corporation
InventorsTomoyuki Satori, Masashi Hankawa
Life of this patent
Estimating the term…
Abstract
The invention relates to a four- or five-group zoom lens that ensures wide-angle performance, high zoom ratios and high quality with a more reduced number of lenses than ever before. The zoom lens comprises, in order from its object side, a first lens group G1 having positive power, a second lens group G2 having negative power, a third lens group G3 having positive power, a fourth lens group G4 having negative power and a fifth lens group G5 having positive power. The fourth lens group G4 comprises one lens. For zooming, all the spacings between the respective lens groups vary and the first lens group G1 moves in such a way as to arrive at the object side at the telephoto end position rather than at the wide-angle end position.
Claims38
A wide-angle, high-zoom-ratio zoom lens comprising, in order from an object side thereof, a first lens group having positive power, a second lens group having negative power, a third lens group having positive power, a fourth lens group having negative power and a fifth lens group having positive power, said fourth lens group comprising one lens component, wherein:
- zooming is carried out by varying all spacings between said lens groups, and said first lens group moves in such a way as to arrive at the object side of the zoom lens at a telephoto end position rather than at a wide-angle end position.
A wide-angle, high-zoom-ratio zoom lens comprising, in order from an object side thereof, a first lens group having positive power, a second lens group having negative power, a third lens group having positive power, a fourth lens group having negative power and a fifth lens group having positive power, wherein:
- zooming is carried out by varying all spacings between said lens groups, said first lens group moves in such a way as to arrive at the object side of said zoom lens at a telephoto end position rather than at a wide-angle end position, and upon zooming from the wide-angle end to the telephoto end the spacing between said fourth lens group and said fifth lens group increases monotonically.
A wide-angle, high-zoom-ratio zoom lens comprising, in order from an object side thereof, a first lens group having positive power, a second lens group having negative power, a third lens group having positive power and a fourth lens group having positive power in which zooming is carried out by varying all spacings between said lens groups and said first lens group moves in such a way as to arrive at the object side of said zoom lens at a telephoto end position rather than at a wide-angle end position, wherein:
- said third lens group is composed of a front subunit and a rear subunit wherein said rear subunit in said third lens group is composed of one lens component and said front subunit and rear subunit in said third lens group move independently during zooming.
Dependencies are inferred from the claim text.