Zoom lens and image pickup apparatus equipped with zoom lens

An image pickup apparatus comprising:

• a zoom lens comprising in order from an object side to an image side:
• 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 second lens unit and the third lens unit move so that the distance between the first lens unit and the second lens unit is increased and the distance between the second lens unit and the third lens unit is decreased at the time of zooming from a wide- angle end to a telephoto end,
• the first lens unit and the fourth lens unit are fixed for the zooming, and
• when M2 is the amount of movement of the second lens unit at the time of the zooming from the wide-angle end to the telephoto end, and M3 is the amount of movement of the third lens unit at the time of zooming from the wide-angle end to the telephoto end, the conditional expression;
• 0.2<|M2/M3|<5.0
• is satisfied;
• and
• an image pickup element configured to receive an image formed by the zoom lens.

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

• 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 second lens unit and the third lens unit move so that the distance between the first lens unit and the second lens unit is increased and the distance between the second lens unit and the third lens unit is decreased at the time of zooming from the wide-angle end to the telephoto end
• the first lens unit and the fourth lens unit are fixed for the zooming,
• when M3 is an amount of movement of the third lens unit at the time of zooming from the wide-angle end and fw is a focal length of the entire system at the wide-angle end, the conditional expression:
• 0.6<M3/fw<10.0
• is satisfied.

The image pickup apparatus comprising:

• a zoom lens comprising in order from an object side to an image side:
• 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 second lens unit and the third lens unit move so that the distance between the first lens unit and the second lens unit is increased and the distance between the second lens unit and the third lens unit is decreased at the time of zooming from the wide-angle end to the telephoto end
• the first lens unit and the fourth lens unit are fixed for the zooming,
• when M3 is an amount of movement of the third lens unit at the time of zooming from the wide-angle end and fw is a focal length of the entire system at the wide-angle end, the conditional expression:
• 0.6<M3/fw<10.0
• is satisfied;
• and
• an image pickup element configured to receive an image formed by the zoom lens.