Zoom lens and imaging apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorShinichiro Saito
Life of this patent
Estimating the term…
Abstract
A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, and a rear group having a positive refractive power as a whole including at least one lens unit. During zooming from a wide-angle end to a telephoto end, a distance between adjacent lens units changes. The first lens unit includes at least three negative single lenses, and a predetermined condition is satisfied.
Claims20
A zoom lens comprising, in order from an object side to an image side, a first lens unit having a negative refractive power, and a rear group having a positive refractive power as a whole including at least one lens unit,
- wherein during zooming from a wide-angle end to a telephoto end, a distance between adjacent lens units changes,
- wherein the first lens unit includes at least three negative single lenses, and
- wherein when the following conditional expressions are satisfied:
- 1.93<|f1|/fw<6.50
- 0.10<fG1N/f1<2.00
- where f1 is a focal length of the first lens unit, fw is a focal length of the zoom lens at the wide-angle end, and fG1N is a focal length of a negative lens G1N closest to the object side in the first lens unit.
An imaging apparatus comprising:
- a zoom lens;
- and
- an image sensor configured to receive an image formed by the zoom lens,
- wherein the zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, and a rear group having a positive refractive power as a whole including at least one lens unit,
- wherein during zooming from a wide-angle end to a telephoto end, a distance between adjacent lens units changes,
- wherein the first lens unit includes at least three negative single lenses, and
- wherein when the following conditional expressions are satisfied:
- 1.93<|f1|/fw<6.50
- 0.10<fG1N/f1<2.00
- where f1 is a focal length of the first lens unit, fw is a focal length of the zoom lens at the wide-angle end, and fG1N is a focal length of a negative lens G1N closest to the object side in the first lens unit.
Dependencies are inferred from the claim text.