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Message: <blockquote data-quote="Omid" data-source="post: 3445655" data-attributes="member: 16724">Yes, of course 95% is "better" if all thing were being equal.  But the improvements is barely perceptible and you just confirmed that this much change in brightness is not significant in astronomy either. OK, going back to real innovations..  The optimal gazing angle for human vision is 15 to 30 degrees below the horizontal line. It has been suggested that 15 degree below horizon is optimal for observing far object and 30 degree is better when they eyes converge to look at something close (like a book). This makes sense since this is how we usually hold a news paper or book to read.  In addition, research in human vision has shown that the optimal acuity occurs not when the eyes are relaxed but when they are converged to focus on a target at about one meter or so.. This is also very interesting and has implications when using binoculars. I am cooking up another innovation based on these ergonomic considerations.. not quite ready yet.. will talk about it in future posts <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />-OmidPS. I received the 3D book you recommended today and I am reading it. Very nice book, Thank you!</blockquote>