Macro lens, optical apparatus, and method for manufacturing the macro lens

A macro lens comprising, in order from an object:

• a first lens group;
• a second lens group;
• and
• a third lens group;
• combined refractive power of the first lens group and the second lens group being positive,
• the first lens group and the second lens group being movable to the object side for varying focusing from infinity to a close distance,
• at least a portion of the third lens group being movable in a direction perpendicular to an optical axis as a shift lens group, and
• the following conditional expression being satisfied:
• 0.72<|fvr|/f12<1.50
• where f12 denotes a combined focal length of the first lens group and the second lens group upon focusing on the object locating at infinity, and fvr denotes a focal length of the shift lens group.

A macro lens comprising, in order from an object:

• a first lens group;
• a second lens group;
• and
• a third lens group;
• combined refractive power of the first lens group and the second lens group being positive,
• the first lens group and the second lens group being movable to the object side for varying focusing from infinity to a close distance,
• each lens group including at least one positive lens and at least one negative lens, and
• the following conditional expressions being satisfied:
• 0.30<X2/(f×β)<0.55
• 2.00<f1/f2<8.00
• where X2 denotes a moving amount of the second lens group upon varying focusing from infinity to the close distance in which X2 is positive upon moving to the image plane side, β denotes an imaging magnification upon focusing on the object locating at the close distance, f1 denotes a focal length of the first lens group, and f2 denotes a focal length of the second lens group.

A method for manufacturing a macro lens that includes, in order from an object, a first lens group, a second lens group, and a third lens group, the method comprising steps of:

• disposing a positive lens and a negative lens in each lens group;
• disposing each lens in the first lens group and the second lens group in such manner that combined refractive power of the first lens group and the second lens group becomes positive, and each lens satisfies the following conditional expressions:
• 0.40<f12/f<0.75
• 2.00<f1/f2<8.00
• where f denotes a focal length of the macro lens, f12 denotes a combined focal length of the first lens group and the second lens group upon focusing on the object locating at infinity, f1 denotes a focal length of the first lens group, and f2 denotes a focal length of the second lens group;
• and
• disposing the first lens group and the second lens group movable upon varying focusing from infinity to a close distance.

A method for manufacturing a macro lens that includes, in order from an object, a first lens group, a second lens group, and a third lens group, the method comprising steps of:

• disposing each lens in the first lens group and the second lens group in such manner that combined refractive power of the first lens group and the second lens group becomes positive, and each lens satisfies the following conditional expression:
• 0.72<|fvr|/f12<1.50
• where f12 denotes a combined focal length of the first lens group and the second lens group upon focusing on the object locating at infinity, and fvr denotes a focal length of the shift lens group;
• and
• moving at least a portion of the third lens group in a direction perpendicular to an optical axis.