1. An image sensor assembly comprising: (a) a fixed focal length optical lens; (b) a mirror that reflects light from a scene to an optical lens and moves into a plurality of positions; and (c) an image sensor that receives the light after it passes through the optical lens and captures a plurality of images that represents each image captured from each position of the mirror; wherein at least portions of the plurality of images are stitched together to form a composite image with a desired zoom factor; wherein the image sensor pixels are binned in reverse correspondence to the zoom factor for one or more of the captured images; a binning factor of the binned images is proportional to the number of mirror positions which forms a degree of binning, and exposure time for each individual image is reduced to match the degree of binning for the image.