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

A zoom optical system comprising:

• a first lens group having negative refractive power;
• a second lens group having positive refractive power, the second lens group being disposed further toward an image than the first lens group;
• and
• a succeeding lens group having a vibration-isolating group that moves so as to have a displacement component in a direction orthogonal to an optical axis, the succeeding lens group being disposed further toward the image than the second lens group, wherein
• the first lens group comprising, in order from an object, a negative lens, a negative lens and a negative lens,
• the second lens group including at least two lens components, the lens component being either a single lens or a cemented lens,
• a distance between the first lens group and the second lens group changes and a distance between the second lens group and the succeeding lens group changes upon zooming, and
• the following conditional expression is satisfied:
• 0.200<(−f1)/f2<0.500
• where,
• f1:
• a focal length of the first lens group, and
• f2:
• a focal length of the second lens group.

A method for manufacturing a zoom optical system comprising:

• a first lens group having negative refractive power;
• a second lens group having positive refractive power, the second lens group being disposed further toward an image than the first lens group;
• and
• a succeeding lens group comprising a vibration-isolating group that moves so as to have a displacement component in a direction orthogonal to an optical axis, the succeeding lens group being disposed further toward the image than the second lens group, wherein
• the first lens group comprising, in order from an object, a negative lens, a negative lens and a negative lens,
• the second lens group including at least two lens components, the lens component being either a single lens or a cemented lens, and
• the lens groups are disposed such that a distance between the first lens group and the second lens group changes and a distance between the second lens group and the succeeding lens group changes upon zooming, and
• either one of the following conditional expressions is satisfied:
• 4.899≤|f1VRaw/fw|<1000.000 or
• 0.200<(−f1)/f2<0.500
• where,
• f1VRaw:
• a composite focal length in a wide-angle end state of a lens disposed further toward the object than the vibration-isolating group,
• fw:
• a focal length of the whole system in the wide-angle end state,
• f1:
• a focal length of the first lens group, and
• f2:
• a focal length of the second lens group.