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

A zoom optical system comprising:

• a first lens group having positive refractive power and disposed closest to an object side, the first lens group including a plurality of lenses;
• a second lens group;
• and
• a rear lens group, wherein
• spaces between the lens groups change at zooming,
• the first lens group includes a positive lens closest to the object side, and
• the following conditional expression is satisfied:
• 0.113≤D1MAX/f1<0.133
• 0.20<f1/ft≤0.422
• where
• D1MAX:
• maximum air space on an optical axis between two adjacent lenses in the first lens group,
• f1:
• focal length of the first lens group, and
• ft:
• overall focal length of the zoom optical system in a telephoto end state.

A method for manufacturing a zoom optical system including a first lens group having positive refractive power and disposed closest to an object side, a second lens group, and a rear lens group, the method comprising:

• disposing a positive closest to the object side in the first lens group;
• and
• satisfying the following conditional expression:
• 0.30<D1MAX/G1d<0.70
• 0.20<f1/ft≤0.422
• 0.113≤D1MAX/f1<0.133
• where
• D1MAX:
• maximum air space on an optical axis between two aadjacent lenses in the first lens group,
• G1d:
• thickness of the first lens group on the optical axis,
• f1:
• focal length of the first lens group, and
• ft:
• overall focal length of the zoom optical system in a telephoto end state.