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Antlia EDGE Very Narrow Band Light Pollution Filter
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The Antlia 4.5mm H-alpha (Ha) filter is suitable for imaging diffuse nebulae, planetary nebulae and Ha-rich supernova remnants. The 4.5nm wide bandwidth is centered on the H-alpha line at 656.3nm. The thinness of the bandwidth allows deep sky imaging even in very difficult light pollution conditions and greatly increases the contrast of objects under very dark skies. All the parasitic lines of light pollution are eliminated, in particular those of mercury vapor and sodium lamps.
Antlia EDGE narrowband filters are designed to bring out the faintest details of nebulae by removing unwanted wavelengths from the sky background. The narrower the bandwidth, the more effective the filter. The transmission of the filters reaches 94% at 656.3nm. The optical density outside the transmission zone is OD5 (0.001%), which offers an excellent signal-to-noise ratio and a clean cut of the other lines. The clear cut of the signal outside the transmission zone is an important parameter since it conditions the quality of the filtration. The greater the cut-off slope, the greater the contrast between the H-alpha signal and the background of the sky which has become perfectly black. Additionally, a sharp cutoff minimizes halos around bright stars.
During manufacturing, Antlia carries out extremely strict quality control. Each filter is tested and measured to verify that it meets the high performance requirements of the specification. The low tolerances require the use of perfectly homogeneous substrates and a uniform thickness; deviation from specification shall not exceed 0.05mm.
The wavelength in nanometers is on the abscissa. The percentage of transmission is on the ordinate. The half-height transmission width is 4.5nm and the filter is centered at 656.3nm
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Antlia EDGE Very Narrow Band Light Pollution Filter
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