SII 7nm Prime filter - 36mm (unmounted)

Antlia SII 7nm Prime filter

Capture low-level ionized sulfur emissions with precision thanks to the Antlia SII 7nm Prime filter. With high transmission and excellent suppression of light interference, this filter is optimized for deep-sky astrophotography, even with fast lenses up to f/2.

Key features

• High transmission (>90% at 672.4nm) for maximum signal from SII nebulae.
• Bandwidth 7nm to efficiently pick up SII lines at 671.6nm and 673.1nm.
• OD4 deletion parasitic wavelengths for a better signal-to-noise ratio.
• Compatible with high-speed optics up to f/2 without any noticeable loss of performance.
• Spectral profile with abrupt cut-off to minimize halos around bright stars.

Ideal applications

• Imaging SII emission nebulae
• Observation of planetary nebulae, Wolf-Rayet and supernova remnants
• Deep-sky photography and polluted areas

Technical specifications

Available formats

• Unmounted: Ø36mm

Design and benefits

• Use of a single substrate to avoid internal reflections
• Surface treated to reduce scratching
• Blackened edges to eliminate stray reflections
• Optimized for deep-sky viewing, even in bright environments

Safety warning

Warning: never observe the Sun with this filter. This would cause serious, irreversible eye damage.