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205 EUR
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price without VAT: 166 EUR
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Askar SII 7 nm 36 mm is the highest class filter transmitting light with a wavelength of 671.6 nm emitted by double ionized sulfur atoms, the registration of which is particularly important when photographing nebula objects, as well as remnants of supernova explosions.
With an half-bandwidth of just 7 nm, this filter combines the ability to almost completely eliminate the undesirable component from sodium and mercury lamps with a high transmission for the SII spectrum line , one of the most important from the point of view of astrophotography.
Attention! The Askar SII filter is not recommended for visual observing, or for photographing the sun or other objects that do not emit SII lines. • a bandpass filter with a maximum transmission for radiation with a wavelength of 671.6 nm
• model with a diameter of 36 millimeters, rimless
• very narrow half-width of the transmitted band (FWHM = 7 nm)
• OD4 equivalent optical density guaranteeing the effectiveness of cutting out light pollution at the level of 99.99% • filter type: bandpass filter
• Filter diameter: 36 mm
• filter thickness: 1.85 ± 0.1 mm
• filter shape: round
• transmitted bands: SII (671.6 nm)
• location of the maximum peak transmittance (CWL): 671.6 ± 1 nm
• Half bandwidth (FWHM): 7 ± 1 nm
• maximum transmission:> 90%
• 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)
• efficiency in blocking light pollution:> 99.99%
• equivalent optical density for blocked lines: OD4 (200 - 1050 nm)
• surface quality index: 60/40
• parallelism: 30 "
• light incidence angle: 0 - 8 °
• frame: absent • Askar SII 7 nm 36 mm filter 24 months
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