Astronomik OIII 6nm CCD Clip-Filter EOS XL (SKU: 10202093 / 8h00nk) all astro filters opinie

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Astronomik OIII 6 nm CCD Clip-Filter EOS XL (SKU: 10202093 / 8h00nk) is a narrowband filter designed for imaging nebulae with oxygen OIII emission. It significantly increases contrast between objects emitting at 496 nm and 501 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 OIII emission lines (496 nm and 501 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 OIII filter expands your imaging possibilities by capturing greenish and bluish structures that make planetary nebulae, star-forming regions, and supernova remnants excellent targets.

Key features

• narrowband filter for OIII emission lines: 496 nm and 501 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 OIII 6 nm CCD Clip-Filter EOS XL
• high-quality, durable filter box

Technical specifications

• emission lines: 496 nm and 501 nm
• full width at half maximum (FWHM): 6 nm
• guaranteed transmission: > 90% (12 nm) and 88% (6 nm) at the main OIII line 501 nm
• typical transmission: 95% (12 nm) and 92% (6 nm) at the main OIII line 501 nm
• 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 OIII 6 nm enables detailed imaging of nebular structures in oxygen emission lines, combining high signal transmission with very effective suppression of background light under light-polluted skies.