Astronomik H-alpha 12nm XT Clip-Filter Sony A7 (SKU: 10216090 / 8h11ua) all astro filters opinie

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Astronomik H-alpha 12 nm XT Clip Sony A7 (Astronomik, SKU: 10216090 / 8h11ua) is a narrowband emission filter designed for imaging hydrogen nebulae under both light-polluted and dark skies. It significantly enhances the contrast between objects emitting at the H-alpha line (656 nm) and the sky background.

The filter completely blocks sodium (Na) and mercury (Hg) lamp emissions, natural airglow and most moonlight. With a narrow 12 nm bandwidth and high transmission, it selectively passes radiation around 656 nm while blocking unwanted wavelengths from ultraviolet (UV) to infrared (IR).

In areas with low light pollution, image background is typically limited by the sensor’s dark current rather than sky brightness, so reducing bandwidth further does not reveal additional object detail.

WARNING: This filter MUST NOT be used for solar observation.

Narrowband astrophotography

Astronomik narrowband filters are among the most effective tools for imaging under heavy light pollution. The H-alpha filter is usually the first choice for emission nebula imaging, even under full moon conditions. Combined with OIII and SII filters, it enables imaging in the HSO (H-alpha, SII, OIII) palette.

12 nm vs 6 nm

• 6 nm version – ideal for very faint objects and extreme light pollution
• 12 nm version – better suited for typical DSLR/CMOS/CCD cameras with normal or higher dark current and for cameras with integrated guiding sensors

MFR and MaxFR coatings

• MFR coating: full performance from f/3 to f/∞ (12 nm)
• MaxFR coating: optimized for very fast optics (down to f/1.7)
• no halos, minimal scatter, maximum contrast

XT filters

The XT version is specially designed for wide-angle astrophotography. Its extremely thin substrate (0.3 mm or 0.5 mm) minimizes star distortion in the image corners.

Technical specifications

• guaranteed transmission > 90% at 656 nm
• typical transmission: 96% (12 nm)
• bandwidth: 12 nm
• glass thickness: 1 mm (except OWB Type 3 and XT filters)
• finely polished optical glass
• resistant to humidity and aging
• Astronomik MFR coating
• parfocal with other Astronomik filters
• diffraction-limited design
• supplied in a durable protective filter box

Each filter undergoes strict quality control. Narrowband filters are measured with a high-end spectrophotometer to verify their published transmission specifications.