Zoom lens and image pickup apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorKohei Kimura
Life of this patent
Estimating the term…
Abstract
A zoom lens consisting of, in order from an object side to an image side, a first lens unit having a negative refractive power, and a rear lens unit having one or more lens units and having a positive refractive power as a whole. Intervals between adjacent lens units change during zooming. The first lens unit has at least three meniscus lenses each having a negative refractive power and a convex shape toward the object side. At least one of the at least three meniscus lenses includes an aspherical surface having a positive aspherical amount. A predetermined condition is satisfied.
Claims14
A zoom lens consisting of, in order from an object side to an image side:
- a first lens unit having a negative refractive power;
- and
- a rear lens group having one or more lens units and having a positive refractive power as a whole,
- wherein intervals between adjacent lens units change during zooming,
- wherein the first lens unit has at least three meniscus lenses each having a negative refractive power and a convex shape toward the object side,
- wherein at least one of the at least three meniscus lenses includes an aspherical surface having a positive aspherical amount, and
- wherein the following conditional expressions are satisfied:
- 2.85<D1/skw<10.00
- −20.0<TTDw/f1<−6.2
- where D1 is a thickness of the first lens unit on an optical axis, skw is a distance on the optical axis from a surface closest to an image plane of the zoom lens to the image plane at a wide-angle end, TTDw is a distance on the optical axis from a surface closest to an object of the zoom lens to the image surface at the wide-angle end, and f1 is a focal length of the first lens unit.
Dependencies are inferred from the claim text.