Zoom lens, image pickup apparatus using the same, image transmission apparatus, and image transmission system
AssigneeOlympus Corporation
InventorsShinichi Mihara, Ryu Ota
Life of this patent
Estimating the term…
Abstract
A zoom lens includes in order from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a negative refractive power, a fourth lens group having a positive refractive power, a fifth lens group having a positive refractive power, and a last lens group having a positive refractive power. At the time of zooming from a wide angle end to a telephoto end, the second lens group and the third lens group move, and one of the fourth lens group, the fifth lens group, and the last lens group moves.
Claims29
A zoom lens comprising in order from an object side:
- a first lens group having a positive refractive power;
- a second lens group having a negative refractive power;
- a third lens group having a negative refractive power;
- a fourth lens group having a positive refractive power;
- a fifth lens group having a positive refractive power;
- and
- a last lens group having a positive refractive power, wherein
- at the time of zooming from a wide angle end to a telephoto end,
- the second lens group and the third lens group move, and
- one of the fourth lens group, the fifth lens group, and the last lens group moves, wherein the zoom lens satisfies the following conditional expression:
- 0.1<|β23W|<0.30,
- where β23W denotes a combined magnification of the second lens group and the third lens group, at the wide angle end, and is a magnification at the time of infinite object point focusing.
Dependencies are inferred from the claim text.