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Old 30-04-2007, 04:48 PM
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janoskiss (Steve H)
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I would find it very hard to believe that the combination of two broadband filters could replace a narrowband filter, i.e., it might have 95% transmission at H-alpha, but it will not have near-0% transmission in other parts of the spectrum. To really image in H-alpha you have to have a narrow band filter IMO.
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