Astronomik H-alpha 4nm Filter 50mm (SKU: 8h11to / 10202350) all astro filters opinie

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Astronomik H-alpha 4nm 50 mm Filter is a narrowband emission line filter designed for imaging hydrogen emission nebulae emitting light at the H-alpha wavelength of 656 nm. It significantly enhances nebular contrast relative to the sky background under both light-polluted and dark sky conditions.

Key features

• selective transmission of the H-alpha emission line (656 nm)
• very narrow 4 nm bandwidth for maximum background suppression
• effective blocking of sodium (Na), mercury (Hg) vapor lamps, natural airglow and most moonlight
• high contrast imaging of hydrogen nebulae under heavy light pollution
• complete blocking of unwanted light from UV to IR
• suitable for HSO (H-alpha, SII, OIII) narrowband imaging

Astrophotography applications

• imaging hydrogen emission nebulae
• primary narrowband filter for heavy light-pollution conditions
• imaging during bright moon phases
• capturing faint structures in dense Milky Way star fields

Differences between Astronomik H-alpha filters

• 4 nm version: maximum background suppression, recommended for very low dark current cameras and extremely light-polluted sites
• 6 nm version: balance between background suppression and guide star availability
• 12 nm version: designed for DSLR cameras and CCD sensors with higher dark current

Astronomik MFR and MaxFR coatings

• MFR coating: full UV–IR blocking, extremely high contrast, no reflections or halos
• H-alpha 4 nm with MFR coating: recommended for optical systems from f/4.5 to f/15 without significant transmission loss
• MaxFR coating: optimized for very fast optical systems (4 nm version currently under development)

Important notice

• the Astronomik H-alpha filter is not intended for solar observation and must not be used for solar imaging or visual observation

Technical specifications

• filter type: narrowband H-alpha emission line filter
• bandwidth (FWHM): 4 nm
• H-alpha wavelength: 656 nm
• guaranteed transmission: >90%
• typical transmission: 93%
• blocking range: UV to IR
• glass thickness: 1 mm
• diameter: 50 mm (unmounted)
• material: finely polished optical glass free of striae and internal stress
• coating: Astronomik MFR
• parfocal: yes, with other Astronomik filters
• optical quality: diffraction limited
• durability: resistant to humidity and aging effects
• quality control: individually measured with a PerkinElmer spectrophotometer
• manufacturer: Astronomik
• SKU: 8h11to / 10202350