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Great greg 2005-08-02 8:38

Beautiful shot, David. Is the light from the left from the Moon?

Although stars do have colours, I'm not sure you can trust the colours that a typical digital camera shows you in this case. If the light from the star is well-focussed, it falls on a single pixel of the sensor array. And these pixels have alternate red, green, blue (or GRGB) filters over them. If you hit a red one, I suppose you get a red star...

Cameras used for astronomy don't have this filter array, but get their colours by making several exposures through different (whole-image) filters.

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Old 08-02-2005, 05:54 PM
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dsidwell dsidwell is offline
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Default To greg: Yes!

Hey Greg, this is so true, but I hadn't really thought of it. Thanks!
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