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A naked eye sunspot
Photo processed with DxO Optics
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768 x 1024 pixels (238 kB)

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 768 x 1024 pixels 
(238 ko)
Instrument   50 mm focal length
Exposure & film   1/200 s with digital camera Canon 350D + Sigma 18-50 1:2.8
Date & place   November 16, 2006, Quimper
Sometime, the Sun is stricken by a blackhead visible to the naked eye (if you protect your eyes from the blinding sunlight). It's not acne, because the Sun has finished its adolescence since a long time... about 4.5 billion years! This black spot is a cooler area on the Sun's surface, which is thus darker and appears to be black by contrast.
In this picture taken with a 50 mm lens, I put a solar eclipse filter in front of the Sun. The sunspot in visible on the green tint solar disk.
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 The others pictures of "Sun"
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