Zoom lens and imaging apparatus

A zoom lens, consisting of a first lens group having a positive refractive power and being fixed during zooming, a second lens group having a negative refractive power and being moved from the object side to the image plane side during zooming from the wide angle end to the telephoto end, a third lens group having a positive refractive power and being moved during zooming, and a fourth lens group having a positive refractive power and being fixed during zooming, in order from the object side wherein:

• the second lens group and the third lens group each pass through a point where the imaging magnification of each corresponding lens group is −1× at the same time during zooming from the wide angle end to the telephoto end;
• the fourth lens group includes, on the most object side, a vibration-proof lens group G4A which is moved in a direction perpendicular to the optical axis for vibration-proofing;
• the vibration-proof lens group G4A is composed of a negative lens L41, a positive meniscus lens L42 with a convex surface on the object side, and a negative lens L43, in order from the object side;
• and
• either one of the negative lens L41 and the negative lens L43 satisfies conditional expressions given below:
• N4<1.68 (1)
• 58<ν4 (2)
• where,
• N4:
• refractive index of the negative lens L41 or the negative lens L43, and
• ν4:
• Abbe number of the negative lens L41 or the negative lens L43.