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Old 25-11-2015, 06:37 AM
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Slawomir (Suavi)
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What's also important is good out-of-band blocking across a wide range of wavelengths (300 to 1100nm), otherwise a filter won't provide expected contrast.

I believe that currently 3nm Astrodons are as narrow as practically possible while keeping important emission at circa 97% at f9 and with effective out-of-band blocking.
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