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nebula filter


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A filter that transmits only selected visual spectral lines from emission nebulae. A typical filter transmits a band 25 nm wide, including the O III (495.9 and 500.7 nm) and Hβ (485.6 nm) lines. Narrow-band filters transmit bands just 10 nm wide, isolating either O III or Hβ.

Subjects: Astronomy and Astrophysics.


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