Astronomik SII 6nm CCD 50 x 50mm& 178;, unmounted (SKU: 10216651 / 8h00nu) all astro filters opinie

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The Astronomik SII 6nm CCD Filter 50 x 50 mm, unmounted (SKU: 10216651 / 8h00nu) is a high-quality narrowband 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 observed object and the sky background. The square 50 x 50 mm format is intended for use in filter wheels and astronomical camera systems requiring unmounted filters.

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 both from heavily light-polluted locations and under dark skies.

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

The SII filter is an essential component of a narrowband imaging setup. Combined with H-alpha and OIII filters it allows emission-line imaging using the popular HSO palette, producing 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 • filter format: 50 x 50 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

Included items

• Astronomik SII 6nm CCD filter 50 x 50 mm • 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% • filter format: 50 x 50 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/4 – f/∞ • coating durability: highly resistant to scratches, humidity and aging • optical characteristics: parfocal, diffraction-limited design

The Astronomik SII 6nm CCD filter allows astrophotographers to capture sulfur emission structures with extremely high contrast and fine detail even under challenging observing conditions.