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Optolong Hydrogen-Beta 12nm Narrowband Filter

$91.97 $45.99

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The Optolong H-betafilter is designed for nebula observation,with a12nm bandwidth centered on a wavelength of486nm (the frequency of Hydrogen-Beta emissions).

The filter is best suited toalarge aperture telescopeunder clear and dark viewing conditions with good seeing.

Suitable forviewing nebulae such as the Horsehead Nebula and California Nebula.

H-BetaSpectrum

How to read the chart?

The horizontal axis is the Wavelength in Nanometers (nm).

The vertical axis is transmission in %.

TheWHITEline shows the transmission of the filter. Artificial light emission lines (light pollution) are shown inORANGE and the emission lines from H-alpha, H-Beta and O-III in nebulae are shown inGREEN.

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