Zoom lens and imaging apparatus

An imaging apparatus comprising:

• a zoom lens;
• and
• an imaging device that converts an optical image, which is formed by the zoom lens, into an electric signal,
• wherein the zoom lens includes, in order from an object side,
• a first lens group that has a positive refractive power,
• a second lens group that has a negative refractive power,
• a third lens group that has a positive refractive power,
• a fourth lens group that has a negative refractive power, and
• a fifth lens group that has a negative refractive power,
• wherein during zooming from a wide-angle end state in which a focal length is shortest to a telephoto end state in which a focal length is longest, all the lens groups are moved in an optical axis direction such that air spacing between the first lens group and the second lens group increases, air spacing between the second lens group and the third lens group decreases, spacing between the third lens group and the fourth lens group changes, and spacing between the fourth lens group and the fifth lens group changes, and
• wherein the following Conditional Expression (1) is satisfied.
• 1.0<β5w≦4.0, (1)
• where β5w is a lateral magnification of the fifth lens group at a wide-angle end.

A zoom lens comprising, in order from an object side to an image side:

• a first lens group that has a positive refractive power;
• a second lens group that has a negative refractive power;
• a third lens group that has a positive refractive power;
• a fourth lens group that has a negative refractive power;
• and
• a fifth lens group that has a negative refractive power,
• wherein during zooming from a wide-angle end state in which a focal length is shortest to a telephoto end state in which a focal length is longest, the lens groups are moved in an optical axis direction such that air spacing between the first lens group and the second lens group increases, air spacing between the second lens group and the third lens group decreases, and spacing between the third lens group and the fourth lens group changes, and
• wherein the following Conditional Expression (3) is satisfied.
• 1.018<β5w≦4.0, (3)
• where β5w is a lateral magnification of the fifth lens group at a wide-angle end.

An imaging apparatus comprising:

• a zoom lens;
• and
• an imaging device that converts an optical image, which is formed by the zoom lens, into an electric signal,
• wherein the zoom lens includes, in order from an object side,
• a first lens group that has a positive refractive power,
• a second lens group that has a negative refractive power,
• a third lens group that has a positive refractive power,
• a fourth lens group that has a negative refractive power, and
• a fifth lens group that has a negative refractive power,
• wherein during zooming from a wide-angle end state in which a focal length is shortest to a telephoto end state in which a focal length is longest, the lens groups are moved in an optical axis direction such that air spacing between the first lens group and the second lens group increases, air spacing between the second lens group and the third lens group decreases, and spacing between the third lens group and the fourth lens group changes, and
• wherein the following Conditional Expression (3) is satisfied.
• 1.018<β5w≦4.0, (3)
• where β5w is a lateral magnification of the fifth lens group at a wide-angle end.