Zoom lens and image pickup apparatus including the same

An image pickup apparatus comprising:

• a zoom lens;
• and
• a solid-state image pickup element configured to receive an image formed by the zoom lens,
• wherein the zoom lens includes
• a first lens unit having a positive refractive power,
• a second lens unit having a negative refractive power,
• a third lens unit having a positive refractive power,
• a fourth lens unit having a negative refractive power, and
• a fifth lens unit having a positive refractive power,
• wherein the first, second, third, fourth, and fifth lens units are arranged in order from an object side to an image side,
• wherein, during zooming from a wide angle end to a telephoto end, a distance between the first lens unit and the second lens unit increases, a distance between the second lens unit and the third lens unit decreases, a distance between the third lens unit and the fourth lens unit changes, and a distance between the fourth lens unit and the fifth lens unit increases, and
• wherein the following conditional expressions are satisfied:
• 4.0<f1/fw<15.0
• −1.00<M1/TDw<−0.46
• 2.0<|f4|/fw<6.0
• where f1 and f4 represent focal lengths of the first lens unit and the fourth lens unit, fw represents a focal length of the entire zoom lens at the wide angle end, M1 represents a moving amount of the first lens unit during zooming from the wide angle end to the telephoto end, a sign of the moving amount M1 is positive when the first lens unit moves to the image side, and TDw represents a distance from a lens surface closest to the object side in the first lens unit to an image plane at the wide angle end.