Astronomik SII 6nm CCD Clip-Filter EOS XL (SKU: 10202096 / 8h00nw) all astro filters opinie

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The Astronomik SII 6nm CCD Clip-Filter EOS XL (SKU: 10202096 / 8h00nw) is a narrowband emission filter designed for imaging nebulae that emit light in the sulfur [SII] lines. The filter transmits radiation at wavelengths of 671.7 nm and 673.0 nm, significantly increasing contrast between the object and the sky background. The clip-filter design allows installation directly inside compatible full-frame Canon EOS cameras (EOS XL) between the camera mount and the sensor.

The filter effectively blocks light pollution from sodium and mercury vapor lamps, natural airglow and a large portion of moonlight. This allows high-contrast imaging of emission nebulae even from heavily light-polluted locations.

The narrow 6 nm bandwidth efficiently suppresses unwanted light at other wavelengths from ultraviolet to infrared. This filter is particularly suitable for imaging faint objects in star-rich regions of the Milky Way and from sites with extreme light pollution.

The SII filter is an important component of a narrowband imaging setup. Combined with H-alpha and OIII filters it enables imaging in the popular HSO palette (H-alpha, SII, OIII), allowing nebula images similar to those captured by the Hubble Space Telescope.

Key features

• narrowband SII filter for emission nebula imaging • transmission band covering the [SII] lines at 671.7 nm and 673.0 nm • bandwidth: 6 nm • clip-filter design for full-frame Canon EOS cameras (EOS XL) • effective suppression of light pollution • very high contrast imaging of nebular structures • blocking of unwanted light from UV to IR • Astronomik MFR coating for high transmission and minimal stray light

Included items

• Astronomik SII 6nm CCD Clip-Filter EOS XL • durable protective filter box

Technical specifications

• type: SII narrowband filter • emission lines: 671.7 nm and 673.0 nm • bandwidth (FWHM): 6 nm • guaranteed transmission at SII lines: over 90% • typical transmission at SII lines: 93% • compatibility: full-frame Canon EOS cameras (EOS XL) • glass thickness: 1 mm • material: finely polished optical glass free of streaks, internal stress and bubbles • coating: Astronomik MFR • focal ratio range: f/4 – f/∞ • coating durability: highly resistant to scratches, humidity and aging • optical characteristics: parfocal, diffraction-limited design

The Astronomik SII 6nm CCD Clip-Filter EOS XL allows astrophotographers to capture highly detailed sulfur emission structures even under strong light pollution while maintaining sharp stars and eliminating halos or reflections.