Zoom lens and image pickup apparatus including the same

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 which does not move for zooming;
• a second lens unit having a negative refractive power which moves during zooming;
• and
• an N-th lens unit having a positive refractive power which does not move for zooming and is arranged closest to the image side,
• wherein the N-th lens unit comprises, in order from an object side to an image side:
• a first sub-lens unit;
• and
• a second sub-lens unit configured to be able to move in an optical axis direction, and
• wherein the following conditional expressions are satisfied:
• −2.70<βnw<−1.45;
• and
• 0<βn2<0.75,
• where βnw represents a lateral magnification at a wide angle end of the N-th lens unit and βn2 represents a lateral magnification at a wide angle end of the second sub-lens unit when an axial ray enters from infinity in a state in which focus is at the infinity;
• and
• a solid-state image pick-up element for receiving an image formed by the zoom lens.