Astronomik SII 12nm CCD Clip-Filter EOS XL (SKU: 10202095 / 8h00lr) all astro filters opinie

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Astronomik SII 12 nm CCD Clip-Filter EOS XL (SKU: 10202095 / 8h00lr) is a narrowband filter designed for imaging nebulae with sulphur SII emission. It significantly increases contrast between objects emitting at 671.7 nm and 673 nm and the sky background, both under light-polluted skies and at dark observing sites. This clip-in version is designed for Canon EOS XL cameras.

The filter selectively transmits the SII emission lines (671.7 nm and 673 nm) while effectively blocking unwanted light at other wavelengths from UV to IR. It completely suppresses emission lines from sodium (Na) and mercury (Hg) lamps, all natural airglow lines, and most interfering moonlight, significantly reducing the effects of light pollution.

In areas with low light pollution, the image background is usually limited by the sensor’s dark current rather than sky brightness. Therefore, further suppression of the sky background by reducing the bandwidth (smaller FWHM) does not necessarily reveal additional object detail compared to the 12 nm version.

Astronomik narrowband filters enable high-contrast astrophotography even under difficult observing conditions. Completing a filter set with an SII filter allows creation of images in the HSO (H-alpha, SII, OIII) palette used in emission nebula imaging.

Key features

• narrowband filter for SII emission lines: 671.7 nm and 673 nm
• enhanced contrast between objects and sky background
• complete suppression of sodium (Na) and mercury (Hg) lamp lines
• complete suppression of natural airglow lines and most moonlight
• effective blocking of unwanted light from UV–IR
• extremely scratch-resistant and durable coating
• fully resistant to high humidity and ageing effects
• Astronomik MFR coating
• parfocal with other Astronomik filters
• diffraction-limited design
• clip-in filter designed for Canon EOS XL cameras

Box contents

• Astronomik SII 12 nm CCD Clip-Filter EOS XL
• high-quality, durable filter box

Technical specifications

• emission lines: 671.7 nm and 673 nm
• full width at half maximum (FWHM): 12 nm
• guaranteed transmission: > 90% at both SII lines
• typical transmission: 96% at both SII lines
• blocking range: UV–IR
• glass thickness: 1 mm
• glass: finely polished optical glass, free of striae, internal stress and bubbles
• coating: Astronomik MFR
• recommended f-ratio range: f/3–f/∞ (for MFR coating)
• optical quality: diffraction-limited design
• parfocality: parfocal with other Astronomik filters

Astronomik SII 12 nm enables imaging of nebular structures in sulphur emission lines, combining high signal transmission with effective suppression of background light under light-polluted skies.