Exposure speed, detail required and maximum image area will determine your choices in this area. (qaeducation.co.uk)
The diameter of the whole image area is about that of the full moon on the sky background. (sciencedaily.com)
The company page redesign now puts huge emphasis on two elements, to the exclusion of almost everything else: a large banner image area at the top of the page, and the status update box. (slaw.ca)