Zoom lens

A zoom lens of a fixed total length comprising:

• a first lens group having a negative refractive power;
• a second lens group having a negative refractive power;
• a third lens group having a positive refractive power;
• a fourth lens group having a negative refractive power;
• and
• a fifth lens group having a positive refractive power;
• arranged in the above mentioned order from the object side to the image side;
• wherein,
• at the time of changing the magnification from the wide-angle end toward the telephoto end;
• the first lens group is anchored;
• while
• the second lens group is moved;
• and
• the third lens group and the fourth lens group are moved so as to be located at the object side of the telephoto end relative to the wide-angle end;
• in such a way that
• the interval between the second lens group and the third lens group is decreased at the telephoto end relative to the wide-angle end;
• the interval between the third lens group and the fourth lens group is increased at the telephoto end relative to the wide-angle end;
• and
• the interval between the fourth lens group and the fifth lens group is increased at the telephoto end relative to the wide-angle end;
• and,
• at the time of focusing a near object point from a remote object point,
• the second lens group is moved;
• and,
• the zoom lens satisfies the conditional formula (1-1) shown below:
• 0.5<(d45T−d45W)/fW<2.0 (1-1),
• where
• d45W is the interval between the fourth lens group and the fifth lens group at the wide-angle end on the optical axis;
• d45T is the interval between the fourth lens group and the fifth lens group at the telephoto end on the optical axis;
• and
• fW is the focal length of the entire zoom lens system at the wide-angle end.