Zoom lens and image pickup apparatus

A zoom lens in which a distance between adjacent lens units changes during zooming, the zoom lens comprising, in order from an object side to an image side:

• a first lens unit fixed during zooming and having positive refractive power;
• three or more moving lens units movable during zooming;
• and
• a final lens unit fixed during zooming and having positive refractive power,
• wherein at least part of the first lens unit moves during focusing,
• wherein at least one of a moving lens unit closest to an image plane among the three or more moving lens units and the final lens unit includes a first lens having positive refractive power, and
• wherein the following inequalities are satisfied:
• 1.60≤ngp≤1.73
• 4.1×10−6≤dndTp≤12.0×10−6
• 1.90≤ngp+0.0046×vgp
• 0.3≤dr/fr≤1.5
• where ngp is a refractive index of the first lens for d-line, vgp is an Abbe number of the first lens based on the d-line, dndTp is a temperature coefficient of the refractive index of the first lens for the d-line from 20° C. to 40° C., dr is a distance on an optical axis from a lens surface closest to an object to a lens surface closest to the image plane in the final lens unit, and fr is a focal length of the final lens unit.