Zooming optical system, optical apparatus having the zooming optical system, and method for manufacturing zooming optical system

A zooming optical system comprising, in order from an object side:

• a first lens group having positive refractive power;
• a second lens group having negative refractive power;
• a third lens group having positive refractive power;
• a fourth lens group having negative refractive power;
• a fifth lens group having positive refractive power;
• and a sixth lens group having negative refractive power;
• upon zooming, the first lens group being fixed with respect to an image plane in the direction of the optical axis;
• and
• the zooming optical system satisfying the following conditional expressions:
• 3.10<f1/(−f2)<5.00,
• 0.40<(−f2)/f3<0.60,
• where f1 denotes a focal length of the first lens group, f2 denotes a focal length of the second lens group, and f3 denotes a focal length of the third lens group.

A method for manufacturing a zoom optical system that comprises, in order from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, a fifth lens group having positive refractive power, and a sixth lens group having negative refractive power,

• the method comprising:
• disposing at least a portion of any one lens group among said lens groups to be movable in a direction including a component perpendicular to the optical axis, and
• the following conditional expressions being satisfied:
• 1.62<f1/f3<2.23,
• 1.71<(−f4)/f5<2.99,
• 0.08<(−f2)/TLw<0.15,
• where f1 denotes a focal length of the first lens group, f2 denotes a focal length of the second lens group, f3 denotes a focal length of the third lens group, f4 denotes a focal length of the fourth lens group, f5 denotes a focal length of the fifth lens group, and TLw denotes a total length in a wide angle end state.

A method for manufacturing a zoom optical system that comprises, in order from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, a fifth lens group having positive refractive power, and a sixth lens group having negative refractive power,

• the method comprising:
• disposing lens groups such that, upon zooming, said first lens group is fixed with respect to an image plane in the direction of the optical axis;
• and
• disposing lens groups such that the following conditional expressions are satisfied:
• 3.10<f1/(−f2)<5.00,
• 0.40<(−f2)/f3<0.60,
• where f1 denotes a focal length of said first lens group, f2 denotes a focal length of the second lens group, and f3 denotes a focal length of the third lens group.

A zooming optical system comprising, in order from an object side:

• a first lens group having positive refractive power;
• a second lens group having negative refractive power;
• a third lens group having positive refractive power;
• a fourth lens group having negative refractive power;
• a fifth lens group having positive refractive power;
• and a sixth lens group having negative refractive power;
• at least one lens group among said lens groups being moved such that a component in a direction perpendicular to the optical axis is included;
• upon zooming, said first lens group is fixed with respect to the image plane in the direction of the optical axis;
• and
• the zooming optical system satisfying the following conditional expressions:
• 1.62<f1/f3<2.23
• 1.71<(−f4)/f5<2.99
• where f1 denotes a focal length of the first lens group,
• f3 denotes a focal length of the third lens group,
• f4 denotes a focal length of the fourth lens group, and
• f5 denotes a focal length of the fifth lens group.

A method for manufacturing a zoom optical system that comprises, in order from an object side, a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, a fifth lens group having positive refractive power, and a sixth lens group having negative refractive power,

• the method comprising:
• disposing at least a portion of any one lens group among said lens groups to be movable in a direction including a component perpendicular to the optical axis;
• and
• disposing lens groups such that, upon zooming, said first lens group may fixed with respect to the image plane in the direction of the optical axis, and
• the following conditional expressions being satisfied:
• 1.62<f1/f3<2.23,
• 1.71<(−f4)/f5<2.99,
• where f1 denotes a focal length of the first lens group, f3 denotes a focal length of the third lens group, f4 denotes a focal length of the fourth lens group, f5 denotes a focal length of the fifth lens group.