Astromania 2" NBPF filter suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants. Bright nebulae can be viewed more clearly using NBPF filter in conditions of light pollution.
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12nm Narrowband NBPF Hydrogen Filter
nebula observation allowing 12nm bandwidth of light centered on a wavelength of 660nm to pass through, 90% transmission at H-alpha line 656nm - whether under dark skies or under the sky glow of a city. That means the filter also blocks the infamous stray light and light from mercury and sodium vapour lamps. |
