Zoom lens and imaging apparatus

A zoom lens substantially consisting of:

• a first lens group having a positive refractive power, which is fixed while changing magnification;
• a second lens group having a negative refractive power, which moves from the object side to the image side while changing magnification from the wide angle end to the telephoto end;
• a third lens group having a positive refractive power, which moves while changing magnification;
• a fourth lens group having a positive refractive power, which moves from the image side to the object side while changing magnification from the wide angle end to the telephoto end;
• and
• a fifth lens group having a positive refractive power, which is fixed while changing magnification;
• wherein
• the third lens group and the fourth lens group move relative to each other while changing magnification;
• image formation magnification rates of a combined lens group formed by combining the third lens group and the fourth lens group together and the second lens group simultaneously pass a −1× point when changing magnification from the wide angle end to the telephoto end;
• and
• conditional formula (1) below is satisfied:
• (Dg34max−Dg34min)/fw>2.5 (1), where
• fw:
• the focal length at the wide angle end,
• Dg34max:
• the maximum value of the distance between the third lens group and the fourth lens group while changing magnification, and
• Dg34min:
• the minimum value of the distance between the third lens group and the fourth lens group while changing magnification.