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Message: <blockquote data-quote="Binastro" data-source="post: 3429645" data-attributes="member: 111403">Hi Ed,Too hot to sleep, maybe 95F today.What I mean about actual visual detection is that it is quite different to be seeking for a mouse or a boar in a twilight forest or happening upon a completely unknown object by chance visually, sometimes at the limits of vision.A tripod mounted or IS binocular is much more likely to let one see these strange things than a hand held binocular, and the difference is much more than under test conditions using test charts.Of course one does not usually find or see these chance events. That is the whole point. But neat curves don't cover these discoveries.And one cannot mix trained individuals in one discipline to untrained or people skilled in astronomy or bird watching. I wouldn't have a clue with most unknown birds. Others won't have a clue with strange atmospheric or astronomy events. Things may be blindingly obvious to one person and completely unseen to another.The zodiacal light had to be pointed out to me on La Palma. Once seen it was so easy I couldn't believe I did not notice it.There was probably Geggenschein? also, but I didn't look.My zenithal limit there was mag 7.2 in my mid 40s. I saw numerous faint meteors that others didn't see and M33 was easy to direct vision.As to my local night lighting conditions. It is a mixture of different street lights, numerous security lights. In one direction 5 units each full moon brightness. Plus pockets of light and relative dark. Cloud cover lighting is quite different to transparent or not transparent clear sky.How does one begin to address all this varied spectrum lighting and its effect on my vision?</blockquote>

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