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Message: <blockquote data-quote="Binastro" data-source="post: 3631171" data-attributes="member: 111403">Bill post 18.At night it is thought that a scene is about 40% brighter using two eyes rather than one with unaided eyes.With severe light pollution I cannot verify this now, but it was I think clearly visible to me in the past.Also my eyesight has got worse over time.As to 20x80 and 8x32 binoculars.Much fainter stars are seen with the larger binocular, both because of aperture and magnification.Also much fainter galaxies would be seen.The FOV would be larger with the 8x32.A rich field telescope showing the greatest number of stars is generally thought to be around 5 inch aperture, short focus wide angle refractor.With night time objects it very much depends on the object.M31 is probably best seen in a 7x50.But the main factor by far is how dark the sky is.With daytime objects all bets are off, as there is such a vast array of brightness, objects looked at, FOV stability etc.I personally never used a binoviewer so cannot comment.I see much more now with two eyes than one without optical aid and without my glasses, although the difference was less when I was younger.</blockquote>