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127 EUR
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price without VAT: 104 EUR
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Antlia H-beta and OIII 1.25" is one of the few astronomical filters available on the market, combining excellent astrophotographic properties with full usability in the field of visual observations.
The wide passband of the Antlia H-beta and OIII 1.25" filter includes Hβ lines (486.1 nm) and two spectral lines from the OIII band (500.7 and 495.9 nm), which Combined with their very high transmittance, it allows you to obtain excellent contrast for visual observations and an amazing level of detail when photographing nebular objects.
Attention! The Antlia H-beta and OIII 1.25" filter must not be used for solar observation under any circumstances! • high transmittance for Hβ and OIII bands with efficient blocking of other spectral lines
• designed for visual observations and for cooperation with digital reflex cameras, monochrome and color astronomical cameras
• high-quality glass substrate and excellent manufacturing precision
• ideal for use in the event of strong light pollution • filter type: broadband filter
• Filter diameter: 1.25"
• filter thickness: 2 ± 0.05
• substrate: optical glass
• filter shape: round
• pass bands: Hβ, OIII
• position of the peak of permeability (CWL) for the Hβ band: 486.1 nm
• maximum transmission for the Hβ band: >90%
• location of the peak of transmittance (CWL) for OIII bands: 500.7 nm / 495.9 nm
• maximum transmission for OIII bands: >90%
• near infrared blocking: up to 1050 nm
• optical density equivalent for blocked lines: >OD4 (300 - 1000 nm)
• surface finish quality: 60/40 (according to MIL-O-13830 standard)
• parallelism: 30"
• manufacturing accuracy: λ/4 • Antlia H-beta and OIII 1.25" filters 24 months
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