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575 USD
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price without VAT: 468 USD
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Antlia ALP-T Dual Band 5nm SII + Hβ is a professional astrophotographic filter that passes the Hβ and SII bands. The filter has been designed to work both with reflex cameras (DSLR) and color cameras, as well as with monochrome cameras, in the case of which it allows you to speed up the signal acquisition process by simultaneously exposing the matrix to two spectral lines. This filter is the perfect complement to the ALT-P Dual Band 5nm Hα + OIII version, allowing for even deeper contrast and highlighting the photographed subject from the background.
This filter is characterized by a half-width of the transmission bands of only 5 nm, which, combined with full separation of the Hβ and SII bands, results in a dramatic improvement in the ratio signal to noise, which ultimately translates into a noticeable improvement in sharpness and contrast. The high optical efficiency for the passbands goes hand in hand with the high optical density for the blocked range, thanks to which this filter effectively eliminates the negative impact of light pollution, allowing you to take pictures even in the vicinity of large cities.
Attention! The Antlia ALP-T Dual Band 5nm SII + Hβ filter is not recommended for visual observation. Under no circumstances may it be used to observe the Sun! • high transmittance for Hβ and SII bands with simultaneous efficient blocking of other spectral lines
• designed to work with digital reflex cameras as well as monochrome and color astronomical cameras
• frame with a small thickness minimizing the risk of vignetting
• designed to work in an environment of strong light pollution • filter type: dual band filter
• Filter diameter: 2" mm
• filter thickness: 2 ± 0.05
• filter shape: round
• pass bands: Hβ, SII
• position of the peak of permeability (CWL) for the Hβ band: 486.1 nm
• half bandwidth (FWHM): 5 nm
• maximum transmission: 85%
• position of the peak of permeability (CWL) for the SII band: 672.4 nm
• half bandwidth (FWHM): 5 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)
• optical density equivalent for blocked lines: >OD4.5
• IR blocking range: up to 1100 nm
• frame: black, anodized
• holder thread: M48x0.75 • Antlia ALP-T Dual Band 5nm SII + Hβ filter 3-year manufacturer's warranty (for delamination of the filter and substrate)
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