Astronomik H-alpha 12nm CCD SC Rear Cell (2 / 24TPI) (SKU: 10212050 / 8h00ai) all astro filters opinie

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Astronomik H-alpha 12 nm CCD SC Rear Cell (2" / 24TPI) Filter (SKU: 10212050 / 8h00ai) 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 version is designed for installation in the SC Rear Cell (2" / 24TPI) thread, allowing the filter to be mounted directly at the rear of Schmidt-Cassegrain telescopes.

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.

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. The H-alpha filter is typically the first element 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
• 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 wavelengths 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
• mounting: SC Rear Cell (2" / 24TPI)

Box contents

• Astronomik H-alpha 12 nm CCD SC Rear Cell (2" / 24TPI) filter
• 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 in the SC Rear Cell version enables convenient installation on Schmidt-Cassegrain telescopes while providing high emission-line transmission and effective background suppression for detailed hydrogen nebula imaging.