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Antlia S II 2.8 nm Ultra 36 mm is a professional astrophotographic filter that transmits light with a wavelength of 672.4 nm emitted by ionized sulfur atoms, the registration of which is particularly important when photographing emission nebulae.
With a very narrow half-bandwidth of 2.8 nm, this filter combines the ability to almost completely eliminate the unwanted component from sodium and mercury lamps with high transmittance ± for the O III spectral line, one of the most important for astrophotography. To ensure high contrast, the filters have been covered with technologically advanced coatings, and their edges have been darkened. All these features mean that this filter offers almost 30 percent better signal than in the case of analogous models in the Antlia Pro series.
The Antlia S II 2.8 nm Ultra 36 mm filter, thanks to the carefully selected spectral characteristics, does not show a significant decrease in transmittance resulting from the shift of the maximum transmission peak (CWL). This means that the filter will work perfectly with telescopes with a light intensity of f/3.5 and even higher, thanks to the flat course of the maximum transmission band.
Attention! The S II filter is not recommended for visual observation or solar observation. • bandpass filter made on a high-quality optical substrate with maximum transmission for radiation with a wavelength of 500.7 nm
• substrate made of quartz glass with increased thermal stability and high mechanical resistance
• compatible with astrographs with light intensity up to f/3.5 while maintaining minimal signal loss
• half bandwidth of transmission (FWHM) of 2.8 nm
• optical density equivalent OD5 guaranteeing high efficiency of light pollution removal • filter type: bandpass filter
• substrate material: quartz glass
• Filter diameter: 36 mm
• filter thickness: 2 ± 0.05 mm
• filter shape: round
• pass bands: S II (672.4 nm)
• location of the peak of transmittance (CWL): 672.4
• half bandwidth (FWHM): 2.8 ± 0.5 nm
• maximum transmission: 97%
• blocked bands: mercury lamps (435.8 nm, 546.1 nm, 577 nm, 578.1 nm), sodium lamps (598 nm, 589.6 nm, 615.4 nm, 616.1 nm)
• optical density equivalent for blocked lines: OD5 (300 - 1000 nm) • Antlia S II 2.8nm Ultra 36mm filter 3-year manufacturer's warranty (for delamination of the filter and substrate)
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