Image sensing apparatus, control method thereof, and storage medium

An apparatus having an electronic zoom function, comprising an image sensing element, a zoom magnification setting unit, a pixel signal readout unit, an image processor, and a controller which, when the zoom magnification is between first and second zoom magnifications, controls to read out pixel signals of a first pixel count, and to generate the image using pixel signals of a second pixel count, and when the zoom magnification is between third and fourth zoom magnifications, controls to read out pixel signals of a third pixel count, and to generate the image using pixel signals of a fourth pixel count, the second pixel count is not larger than the first pixel count, the fourth pixel count is not larger than the third pixel count.