Thread: I guess I need a filter?
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Old 16-12-2013, 02:37 PM
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cometcatcher (Kevin)
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cometcatcher is offline 		 
Join Date: Jan 2005
Location: Cloudy Mackay
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A single polarising filter can be useful for daytime obs if the Moon is at 90 degrees to the Sun or half phase. At that angle you get the greatest sky darkening.
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