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629 zł
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price without VAT: 511,38 zł
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The Astronomik SII 12nm CCD Filter 27mm, unmounted (SKU: 10216327 / 8h00mi) is a narrowband emission filter designed for imaging nebulae that emit light in the sulfur [SII] lines. It records radiation at wavelengths of 671.7 nm and 673.0 nm, significantly increasing contrast between the object and the sky background. The 27 mm unmounted version is intended for use in filter wheels and astronomical cameras.
The filter effectively blocks light pollution from sodium and mercury vapor lamps, natural airglow and a large portion of moonlight. This allows high-contrast nebula imaging both from heavily light-polluted locations and under dark skies.
The 12 nm bandwidth effectively suppresses unwanted light at other wavelengths from ultraviolet to infrared. The filter is optimized for use with modern CCD and CMOS cameras, providing high transmission and excellent contrast of nebular structures.
The SII filter is an essential component of a narrowband imaging set. When combined with H-alpha and OIII filters it allows emission-line imaging using the popular HSO palette, similar to images produced by the Hubble Space Telescope.
• narrowband SII filter for emission nebula imaging
• transmission band covering the [SII] lines at 671.7 nm and 673.0 nm
• bandwidth: 12 nm
• filter diameter: 27 mm (unmounted)
• 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
• Astronomik SII 12nm CCD Filter 27 mm (unmounted)
• durable protective filter box
• type: SII narrowband filter
• emission lines: 671.7 nm, 673.0 nm
• bandwidth (FWHM): 12 nm
• guaranteed transmission at SII lines: over 90%
• typical transmission at SII lines: 96%
• filter diameter: 27 mm (unmounted)
• glass thickness: 1 mm
• material: finely polished optical glass free of streaks, internal stress and bubbles
• coating: Astronomik MFR
• focal ratio range: f/3 – f/∞
• coating durability: highly resistant to scratches, humidity and aging
• optical characteristics: parfocal, diffraction-limited design
The Astronomik SII 12nm CCD filter allows astrophotographers to capture sulfur emission structures with excellent contrast and fine detail, making it an important element of any narrowband imaging setup.
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