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Post by Jairo on Sept 28, 2010 17:05:38 GMT -4
Usually, I see the Sun with many rays spreading from it in pictures. But in some pictures from Apollo, the glare is just a big circle. What causes this difference?
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Post by trebor on Sept 28, 2010 18:58:12 GMT -4
Longer exposure time would cause the glare to obscure the sun spokes. Note that in the earth picture the earth is quite dark and looks like a very short exposure time was used.
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Post by Czero 101 on Sept 28, 2010 20:35:01 GMT -4
Lens design will effect the way the flare looks as well.
Cz
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Post by tedward on Sept 29, 2010 3:04:32 GMT -4
I thought this was down to lens design, number of elements and angle the light comes in to play from bright sources?
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Post by banjomd on Sept 29, 2010 6:07:16 GMT -4
I thought this was down to lens design... including coating/multicoating
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Al Johnston
"Cheer up!" they said, "It could be worse!" So I did, and it was.
Posts: 1,453
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Post by Al Johnston on Sept 29, 2010 6:12:29 GMT -4
The aperture will also have an effect - 'sunstars' are more common when the iris diaphragm is stopped down, and the number of spokes depends on the number of blades making up the diaphragm.
Also, the Apollo images you linked to don't seem to have the Sun in frame, so I wouldn't expect sunstars in those cases.
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Post by Data Cable on Sept 29, 2010 11:21:25 GMT -4
Also, the Apollo images you linked to don't seem to have the Sun in frame, so I wouldn't expect sunstars in those cases. 6950-52, 6971-72, and 6995-98 all definitely did.
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Post by Jairo on Sept 29, 2010 11:51:18 GMT -4
Thank you all for the answers. Now I'm searching for such thing in pictures taken on Earth. Do you know any?
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Post by Jairo on Sept 29, 2010 12:12:22 GMT -4
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