Zoom lens, optical apparatus, and method for manufacturing zoom lens

A method for manufacturing a zoom lens including, in order from an object side along an optical axis, a first lens group having positive refractive power, a second lens group having negative refractive power, and a third lens group having positive refractive power, the method comprising steps of:

• disposing the first lens group, the second lens group and the third lens group movably such that a distance between the first lens group and the second lens group increases, and a distance between the second lens group and the third lens group decreases;
• disposing a positive lens A′ satisfying the following conditional expressions:
• 1.540<ndA′
• 66.5<νdA′
• where ndA′ denotes a refractive index of a material of the positive lens A′, and νdA′ denotes an Abbe number of the material of the positive lens A′, and
• further comprising one of the following features (A), (B), (C), (D), and (E):
• (A) the following conditional expressions being satisfied:
• 3.90<f1/fw<11.00
• 0.48<Δ1/f1<1.10
• where fw denotes a focal length of the zoom lens in the wide-angle end state, f1 denotes a focal length of the first lens group, and Δ1 denotes a moving amount of the first lens group with respect to an image plane from the wide-angle end state to the telephoto end state;
• (B) the following conditional expressions being satisfied:
• 3.90<f1/fw≤6.343
• 0.36<Δ1/f1<1.10;
• (C) disposing the positive lens A′ in the first lens group, and
• the following conditional expressions being satisfied:
• 3.90<f1/fw<11.00
• 0.055<φ1A′/ft<0.420
• where ft denotes a focal length of the zoom lens in the telephoto end state, and φ1A′ denotes an effective diameter of the positive lens A′ in the first lens group;
• (D) disposing, in the third lens group, in order from the object side along the optical axis, a front lens group having positive refractive power, a middle lens group having negative refractive power, and a rear lens group having positive refractive power such that, upon zooming from the wide-angle end state to the telephoto end state, a distance between the front lens group and the middle lens group varies, a distance between the middle lens group and the rear lens group varies, a distance between the first lens group and the second lens group increases, and a distance between the second lens group and third lens group decreases, and
• the following conditional expressions being satisfied:
• 3.90<f1/fw<11.00
• 0.28<f1/ft≤0.358;
• and
• (E) disposing a negative lens that satisfies the following conditional expression in the first lens group:
• 1.903658<ndN
• where ndN denotes a refractive index at d-line of a material of the negative lens in the first lens group, and
• the following conditional expression being satisfied:
• 3.90<f1/fw<11.00.

A zoom lens comprising, in order from an object along an optical axis:

• a first lens group having positive refractive power;
• a second lens group having negative refractive power;
• and
• a third lens group having positive refractive power,
• upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group increasing, and a distance between the second lens group and third lens group decreasing,
• the zoom lens including a positive lens A′ that satisfies the following conditional expressions:
• 1.540<ndA′
• 66.5<νdA′
• where ndA′ denotes a refractive index of a material of the positive lens A′, and νdA′ denotes an Abbe number of the material of the positive lens A′, and
• the following conditional expressions being satisfied:
• 3.90<f1/fw≤6.343
• 0.36<Δ1/f1<1.10
• where fw denotes a focal length of the zoom lens in the wide-angle end state, f1 denotes a focal length of the first lens group, and Δ1 denotes a moving amount of the first lens group with respect to an image plane from the wide-angle end state to the telephoto end state.

A zoom lens comprising, in order from an object along an optical axis:

• a first lens group having positive refractive power;
• a second lens group having negative refractive power;
• and
• a third lens group having positive refractive power,
• upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group increasing, and a distance between the second lens group and third lens group decreasing,
• the first lens group including a positive lens A′ that satisfies the following conditional expressions:
• 1.540<ndA′
• 66.5<νdA′
• where ndA′ denotes a refractive index of a material of the positive lens A′, and νdA′ denotes an Abbe number of the material of the positive lens A′, and
• the following conditional expressions being satisfied:
• 3.90<f1/fw<11.00
• 0.055<φ1A′/ft<0.420
• where fw denotes a focal length of the zoom lens in the wide-angle end state, f1 denotes a focal length of the first lens group, ft denotes a focal length of the zoom lens in the telephoto end state, and φ1A′ denotes an effective diameter of the positive lens A′ in the first lens group.

A zoom lens comprising, in order from an object along an optical axis:

• a first lens group having positive refractive power;
• a second lens group having negative refractive power;
• a third lens group having positive refractive power and including, in order from the object side along the optical axis, a front lens group having positive refractive power, a middle lens group having negative refractive power, and a rear lens group having positive refractive power, and upon zooming from the wide-angle end state to the telephoto end state, a distance between the front lens group and the middle lens group varies, and a distance between the middle lens group and the rear lens group varies;
• upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group increasing, and a distance between the second lens group and third lens group decreasing,
• the zoom lens including a positive lens A′ that satisfies the following conditional expressions:
• 1.540<ndA′
• 66.5<νdA′
• where ndA′ denotes a refractive index of a material of the positive lens A′, and νdA′ denotes an Abbe number of the material of the positive lens A′, and
• the following conditional expressions being satisfied:
• 3.90<f1/fw<11.00
• 0.28<f1/ft<0.358
• where fw denotes a focal length of the zoom lens in the wide-angle end state, f1 denotes a focal length of the first lens group, and ft denotes a focal length of the zoom lens in the telephoto end state.

A zoom lens comprising, in order from an object along an optical axis:

• a first lens group having positive refractive power;
• a second lens group having negative refractive power;
• and
• a third lens group having positive refractive power,
• upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group and the second lens group increasing, and a distance between the second lens group and third lens group decreasing,
• the zoom lens including a positive lens A′ that satisfies the following conditional expressions:
• 1.540<ndA′
• 66.5<νdA′
• where ndA′ denotes a refractive index of a material of the positive lens A′, and νdA′ denotes an Abbe number of the material of the positive lens A′,
• the first lens group including a negative lens that satisfies the following conditional expression:
• 1.903658≤ndN
• where ndN denotes a refractive index at d-line of a material of the negative lens in the first lens group, and
• the following conditional expression being satisfied:
• 3.90<f1/fw<11.00
• where fw denotes a focal length of the zoom lens in the wide-angle end state, and f1 denotes a focal length of the first lens group.