Zoom lens and imaging apparatus

A zoom lens, substantially consisting of:

• a first lens group having a negative refractive power;
• and
• a second lens group having a positive refractive power, provided in this order from an object side;
• the first lens group and the second lens group being moved to change magnification;
• the first lens group substantially consisting of a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, and a fourth lens having a positive refractive power, in this order from the object side;
• and
• the zoom lens satisfying both of the following conditional formulae (1-4) and (2-4) and at least one of the following conditional formulae (1-5) and (2-5):
• 0.00<|f1/f2|<1.04 (1-4)
• 0.00<|fw/f1|<0.61 (2-4)
• 0.30<|f1/f2|<0.90 (1-5)
• 0.20<|fw/f1|<0.50 (2-5)
• wherein fw is the focal length of the entire system at the wide angle end, f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group.