Astronomik H-alpha 12nm CCD Clip-Filter EOS XL (SKU: 10202090 / 8h00lf) all astro filters opinie

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Astronomik H-alpha 12 nm CCD Clip-Filter EOS XL (SKU: 10202090 / 8h00lf) is a narrowband filter designed for imaging hydrogen nebulae emitting light in the H-alpha line. It significantly increases contrast between objects emitting at 656 nm and the sky background, both under light-polluted skies and at dark sites. The 12 nm version is intended for typical DSLR cameras with CMOS sensors as well as CCD cameras with normal or high dark current.

The filter selectively transmits the hydrogen H-alpha emission line (656 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, helping to reduce 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 allow high-contrast astrophotography even in difficult observing conditions. The H-alpha filter is typically the first filter used in a narrowband imaging setup and is ideal for capturing red emission nebulae. Combined with OIII and SII filters, it enables false-colour imaging in the HSO (H-alpha, SII, OIII) palette.

The Astronomik H-alpha filter must not be used for solar observation.

Key features

• narrowband filter for the H-alpha emission line: 656 nm
• strong contrast enhancement between targets 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 H-alpha 12 nm CCD Clip-Filter EOS XL
• high-quality, durable filter box

Technical specifications

• emission line: 656 nm (H-alpha)
• full width at half maximum (FWHM): 12 nm
• guaranteed transmission: > 90% at the H-alpha line
• typical transmission: 96% at the H-alpha line
• 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 H-alpha 12 nm enables detailed imaging of hydrogen nebulae, combining high transmission of the emission line with effective suppression of background light under light-polluted skies.