Astronomik SII 12nm CCD 2 (M48) (SKU: 10216200 / 8h00d6) all astro filters opinie

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Astronomik SII 12 nm CCD Filter 2" (M48) (Astronomik, SKU: 10216200 / 8h00d6) is ideal for imaging nebulae that emit sulfur lines, both from light-polluted locations and from dark observing sites. It significantly increases the contrast between objects emitting at 671.7 nm and 673 nm (SII lines) and the sky background.

The Astronomik SII filter completely suppresses emission lines from artificial light sources such as sodium (Na) and mercury (Hg) lamps, all natural airglow lines and most disturbing moonlight.

Thanks to its narrow full width at half maximum (FWHM) of 12 nm combined with very high transmission, the filter effectively blocks almost all unwanted wavelengths other than 671.7 nm and 673 nm, from ultraviolet (UV) to infrared (IR).

In areas with little light pollution, the background signal in images is typically limited by the dark current of the sensor rather than sky brightness. In such conditions, further suppression of the sky background by reducing the bandwidth does not necessarily reveal additional object details.

Imaging with Astronomik narrowband filters

Imaging with Astronomik narrowband emission-line filters is one of the most effective methods for capturing high-quality astrophotographs in light-polluted environments. An Astronomik H-alpha filter is usually the first filter used, allowing detailed and high-contrast images even under heavy light pollution or during full Moon.

Astronomik H-alpha filters are ideal for imaging all red emission nebulae. Astronomik OIII filters expand imaging possibilities by capturing the green and blue structures typical of planetary nebulae, star-forming regions and supernova remnants.

Completing your filter set with an Astronomik SII filter enables imaging in the HSO (H-alpha, SII, OIII) palette, also known as the Hubble palette, producing spectacular false-color emission-line images.

Difference between Astronomik SII 4 nm, 6 nm and 12 nm filters

The 4 nm and 6 nm Astronomik narrowband emission-line filters are ideal for imaging very faint objects in star-rich regions of the Milky Way. They are also recommended when using cameras with extremely low dark current or when observing from locations with extreme light pollution.

The 12 nm Astronomik narrowband filters were designed for use with typical DSLR cameras with CMOS sensors and CCD cameras with normal or high dark current. They are also the preferred choice for cameras with integrated guiding sensors because they reveal more guide stars.

Difference between Astronomik MFR and MaxFR coatings

Both Astronomik MFR and MaxFR coatings provide excellent blocking across the entire spectral range from UV to IR, extremely high contrast, minimal scattered light, no halos and sharp star images.

• 12 nm MFR-coated filters can be used with instruments from f/3 to f/∞ without significant performance loss
• 6 nm MFR-coated filters can be used with instruments from f/4 to f/∞
• 4 nm MFR-coated filters can be used with instruments from f/4.5 to f/15

The MaxFR coating is designed specifically for very fast optical systems.

• 12 nm filters with MaxFR coating can be used from f/1.7 to f/6 without restrictions and still achieve about 85% of maximum transmission at f/1.4
• 6 nm filters with MaxFR coating can be used from f/2.2 to f/6 and reach about 90% of maximum transmission at f/2
• 4 nm filters with MaxFR coating are currently under development

Technical specifications

• guaranteed transmission above 90% (12 nm, 6 nm and 4 nm) at both SII lines (671.7 nm and 673.0 nm)
• typical transmission: 96% (12 nm) and 93% (6 nm and 4 nm)
• glass thickness: 1 mm (except OWB Type 3 and XT filters)
• finely polished optical glass free of streaks, internal stress and bubbles
• extremely scratch-resistant and durable coating
• completely resistant to humidity and aging effects
• Astronomik MFR coating
• parfocal with other Astronomik filters
• diffraction-limited performance
• optimized transmission ranges
• supplied in a high-quality durable filter box

All Astronomik filters are parfocal and diffraction-limited, ensuring that the optical performance of your telescope remains uncompromised. Each filter undergoes strict quality control and narrowband emission-line filters are individually measured with a PerkinElmer spectrophotometer to verify the published specifications.