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The bandwidth of a Lumicon Hydrogen Beta filter for example is 9 nanometres which equals 90 Angstrom.
The bandwidth of a typical solar filter that shows surface detail on the Sun (other than sunspots) is in the order of 1.0 Angstrom for the Coronado PST and 0.7A for the Coronado SolarMax. There are also filters available from Daystar at 0.6 & 0.5A and these show significantly more detail. Excellent thermal stability is also required for these filters to work.
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