Astronomik H-alpha 6nm CCD Clip-Filter EOS XL (SKU: 10202091 / 8h00lg) all astro filters opinie

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Astronomik H-alpha 6 nm CCD Clip-Filter EOS XL (SKU: 10202091 / 8h00lg) 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 observing sites. This clip-in version is designed for Canon EOS XL cameras.

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, significantly reducing the effects of light pollution.

The 6 nm bandwidth provides very high spectral selectivity and is particularly useful when imaging faint objects in star-rich regions of the Milky Way, as it typically reduces the number of stars recorded in the image. It is also suitable for cameras with very low dark current or for observations from locations with extreme light pollution.

Astronomik narrowband filters enable high-contrast astrophotography even under difficult observing conditions. The H-alpha filter is often the first element of 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
• very high spectral selectivity with 6 nm bandwidth
• strong contrast enhancement against the 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 6 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): 6 nm
• guaranteed transmission: > 90% at the H-alpha line
• typical transmission: 93% 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/4–f/∞ (for MFR coating)
• optical quality: diffraction-limited design
• parfocality: parfocal with other Astronomik filters

Astronomik H-alpha 6 nm allows detailed imaging of hydrogen nebulae, combining high transmission of the emission line with very effective suppression of background light under light-polluted skies.