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Originally posted by greatlakes
Its a halo effect, the sun's light being affected/refracted from the scant atmosphere of the moon or has interaction with the lens to cause the ring halo seen. We have similar halo effects seen on Earth of both the moon and the sun.
Originally posted by Yandros
Granted. But if you observe the photos from Apollo 12 closely you will notice there is a very clear halo already. How many do you propose there are supposed to be?
Originally posted by Yandros
The moon is a hard vacuum, or so we are told. I doubt that any gas particles trapped by the slight gravity would have an overall effect on photographs taken.
Halos form when light from the sun or moon is refracted by ice crystals associated with thin, high-level clouds (like cirrostratus clouds). A 22 degree halo is a ring of light 22 degrees from the sun (or moon) and is the most common type of halo observed and is formed by hexagonal ice crystals with diameters less than 20.5 micrometers.
Originally posted by Yandros
Well if that's not evidence enough...
The earth has an albedo of around 35%. Why doesn't it have a halo when photographed from the moon?
en.wikipedia.org...(optical_phenomenon)
Halos, also known as icebows, are optical phenomena that appear near or around the Sun or Moon, and sometimes near other strong light sources such as street lights. There are many types of optical halos, but they are mostly caused by ice crystals in cold cirrus clouds located high (5–10 km, or 3–6 miles) in the upper troposphere. The particular shape and orientation of the crystals is responsible for the type of halo observed. Light is reflected and refracted by the ice crystals and may split up into colors because of dispersion, similarly to the rainbow.
Originally posted by Yandros
How many different sets of conditions do you propose there are on the day side of the moon? I was under the impression there would only one. That’s sort of the side effect of having little or no atmosphere; no weather.
Originally posted by jra
The halo in the Apollo 12 pics is purely an optical effect called a "lens flare". Could you provide information as to how you think the Sun should look and why?
Personally I see nothing wrong with the photos at all. The Sun is very bright (obviously) and it will create very strong lens flares, be it on Earth or the Moon.
Originally posted by greatlakes
Type of camera used
Type of film used
Time of day
Location of sun relative to photographer
Location of the Earth relative to the photographer
Angles of incidence between the moon, sun and Earth
Type of lens used
Many, many others etc etc
Originally posted by All Seeing Guy
It took a few hours to realise this was lens flare?