SII Antlia 4.5nm Edge filter

Antlia SII 4.5nm EDGE filter

Capture ionized sulfur emissions with exceptional clarity thanks to the Antlia SII 4.5nm EDGE filter. Designed for astrophotography, this filter optimizes transmission and contrast for detailed images of the deep sky.

Why choose the Antlia SII 4.5nm EDGE filter?

• High transmission (>90% at 672.4nm) to capture the faintest SII nebular structures.
• Narrow bandwidth of 4.5nm to maximize contrast and reduce sky background.
• OD5 deletion parasitic wavelengths for a better signal-to-noise ratio.
• Fast compatibility with lenses up to f/3 without significant signal loss.
• High-quality manufacturing One-piece optical substrate, scratch-resistant surface treatment, blackened edges.

Ideal applications

• Imaging SII emission nebulae
• Observation of planetary nebulae and Wolf-Rayet
• Capturing supernova remnants
• Use on polluted skies or dark sites
• Extended photo sessions despite the presence of the Moon

Filter technical specifications

Available sizes

• Mounted: 1.25″, 2″
• Unmounted: Ø31mm, Ø36mm, Ø50mm

Frame features

• Ultra-thin frame to reduce vignetting
• Black anodized finish for optimum protection
• Tamper-proof laser engraving for durable identification

Spectral curves

Important notice

Never look directly at the sun with this filter. This would cause serious, irreversible eye damage.