Zoom lens and image pickup apparatus including same

An image pickup apparatus comprising:

• a zoom lens comprising in order from an object side to an image side, a front lens group having a positive refractive power that does not move for zooming, a magnification-varying lens group including a plurality of lens units that move during zooming, and a rear lens group having a positive refractive power that does not move for zooming, an interval between the lens units adjacent each other being changed during zooming,
• wherein the magnification-varying lens group includes a lens group V having a negative refractive power and a lens unit C having a negative or positive refractive power,
• the lens group V includes a first magnification-varying lens group V1 including in order from the object side to the image side, a lens unit V1a having a negative refractive power and a lens unit V1b having a negative refractive power,
• during zooming from a wide angle end to a telephoto end, both the lens unit V1a and the lens unit V1b move to the image side such that an interval between the lens unit V1a and the lens unit V1b is largest at the telephoto end, and
• a conditional expression of
• 0.40<m1/m2<0.98
• is satisfied, where m1 is a lens unit interval on an optical axis between the lens unit V1a and the lens unit V1b at the wide angle end, and m2 is a maximum lens unit interval on the optical axis between the lens unit V1a and the lens unit V1b during zooming;
• and
• a solid-state image pickup element that receives an image formed by the zoom lens.