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Message: <blockquote data-quote="Binastro" data-source="post: 3183584" data-attributes="member: 111403">. Thanks David for the excellent post 36.I intend asking my imaging friends how the size of stars and their images relates to the magnitude or brightness of the stars. I don't know if this is a linear relationship or logarithmic or something else. Also I don't know whether the light leaks to neighbouring pixels with overexposure.I will also ask my friend who still uses film.I have though noticed that some top quality, say 10×42, binoculars produce smaller star images than do other binoculars. I still don't know whether this is of any significance regarding the size of bright star images, or in the case of Venus. a very brilliant, slightly nonpoint source, object.</blockquote>