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At 07:10 PM 8/25/97 -0400, you wrote:
>Anyone have an answer to this one? I'm not a current subscriber to
"METEOPTIC",
>so please respond to me directly as well as the list. Thanks!
>
>Lew Gramer
>owner-meteorobs_at_latrade.com
>
>------- Forwarded Message
>Name: Gloria Lee Email: lee_gloria_at_gsb.stanford.edu
>Area: Astronomy
>Subject: Why does [halo] around moon look less vivid thru binoculars?
>
>Why does the corona [sic] around the moon
>look less vivid when viewed thru binoculars?
>
>I was looking at the moon on a slightly
>foggy night, and there was a wide halo
>around the moon, somewhat rainbow
>like, presumably from the fog. But
>when I looked at the moon again
>through binoculars, the corona did not
>look nearly as bright, colorful or big.
>Why?
>------- End of Forwarded Message
Lew Gramer:
I would presume that since a halo effect is not really a high
contrast event--and it is large (the thickness of the arc) the spreading
out
of the image by magnifying it with binoculars would tend to reduce its
contrast rather than enhance it. Thus the event would appear less
spectacular through binoculars. The optical excellence of the binoculars
would be an important consideration also. That's my guess...
Gary A. Becker
www.astronomy.org
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