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HorseHead in binoculars .....
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09-04-2018, 04:30 PM
astro744
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Join Date: Apr 2007
Posts: 1,244
I always thought the H-Beta filter is required for the Horsehead nebula rather than the O-III as the latter would in fact filter out crucial wavelengths required to see it. The H-Beta filter is also commonly known as the Horeshead nebula filter.
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