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Message: <blockquote data-quote="ronh" data-source="post: 1324203" data-attributes="member: 55514">Henry and Ed,Thanks for reading, and for your comments, which make me think too, although probably to little avail. I hardly thought I'd put this complicated matter to rest, only wanted to share one small thing I discovered that makes a little bit of sense to me.Henry, thanks for the experiment. It didn't turn out like I would have expected from my reading of Stokes' effect. I tried it with my achromat telescope and it worked as I imagined it would. I guess an astronomical telescope viewing a point source is a lot simpler situation than a complex binocular viewing a scene. I believe that we may infer, however, if you covered the objective entirely, all the CA would disappear!Ron</blockquote>