Astronomik SII 4nm Filter 50mm (SKU: 8h11ts / 10204350) all astro filters opinie

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Astronomik SII 4nm 50 mm Filter is a narrowband emission line filter designed for imaging nebulae emitting light in the ionized sulfur SII lines at 671.7 nm and 673.0 nm. It significantly enhances object contrast under both light-polluted and dark sky conditions.

Key features

• selective transmission of SII emission lines (671.7 nm and 673.0 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 sulfur-rich nebulae under heavy light pollution
• complete blocking of unwanted light from UV to IR
• suitable for creating HSO (H-alpha, SII, OIII) false-color images

Astrophotography applications

• imaging of sulfur-emission nebulae
• complementing H-alpha and OIII filters in HSO imaging
• operation under heavy light pollution and bright moonlight
• imaging faint objects in dense Milky Way star fields

Differences between Astronomik SII filters

• 4 nm version: optimized for maximum background suppression, very low dark current cameras and heavily light-polluted sites
• 6 nm version: balanced solution between background suppression and guide star availability
• 12 nm version: designed for DSLR cameras and CCD sensors with moderate to high dark current

Astronomik MFR and MaxFR coatings

• MFR coating: full UV–IR blocking, high contrast, no reflections or halos
• SII 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)

Technical specifications

• filter type: narrowband SII emission line filter
• bandwidth (FWHM): 4 nm
• SII wavelengths: 671.7 nm and 673.0 nm
• guaranteed transmission: >90% at both SII lines
• 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: 8h11ts / 10204350