1. An image capturing apparatus comprising: an image capturing means, a photometry means for dividing image data output from the image capturing means into a plurality of regions and measuring a luminance of each of the divided regions, a grouping means for generating a plurality of intermediate regions from object luminances output from said photometry means, an evaluation value calculating means for generating an exposure evaluation value from the luminances of said intermediate regions, and a control means for suitably controlling the exposure for image capture in accordance with said measured luminances, wherein said grouping means further includes a means for scanning luminance information output from the photometry means in a horizontal and vertical direction from an observation point, confirming a difference between the luminance of each small photometry region and an average luminance of an object field as a whole, and grouping high luminance regions and low luminance regions of the object field as first intermediate regions.