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217 EUR
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price without VAT: 176 EUR
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Askar H-Alpha 7 nm 31 mm is a top class filter transmitting red light with a wavelength of 656.3 nm emitted by ionized hydrogen atoms, the registration of which is particularly important when photographing emission nebulae.
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 Hα spectral line. , one of the most important from the point of view of astrophotography.
Attention! The Hα filter is not recommended for visual observations. • bandpass filter with maximum transmission for radiation with a wavelength of 656.3 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: 31 mm
• filter thickness: 1.85 ± 0.1 mm
• filter shape: round
• transmitted bands: Hα (656.3 nm)
• location of the maximum permeability peak (CWL): 656.3 ± 1 nm
• Half bandwidth: 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 H-Alpha 7 nm 31 mm filter 24 months
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