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1229 zł
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price without VAT: 999,19 zł
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 Shop online:
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Shop in Warsaw (qty):
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Shop in Chorzow (qty):
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The S2 7 nm photographic filter in a 2" mount (PegasusAstro, SKU: PEG-FLTR-2M-S2) is an extra narrowband filter designed for nebula imaging in the Sulfur II (SII) emission line. It provides a 7 nm bandwidth centered at 672 nm, corresponding to the SII emission line, while effectively suppressing unwanted background light.
The filter reduces the transmission of artificial light produced by high- and low-pressure sodium and mercury vapor lamps, as well as unwanted natural light caused by neutral oxygen emission in the atmosphere (skyglow). This makes it well suited for high-contrast narrowband imaging, especially in SHO (Hubble palette) workflows.
It features 1/4 wavefront polishing and multilayer anti-reflection coatings. The parfocal construction supports multi-filter imaging without the need to refocus when switching filters. The 2" mounted cell with an M48 thread ensures compatibility with standard filter wheels and astrophotography adapters.
• SII narrowband filter with 7 nm bandwidth
• central wavelength: 672 nm (Sulfur II emission line)
• effective suppression of light pollution
• reduced impact of atmospheric skyglow
• parfocal design for multi-filter imaging setups
• multilayer anti-reflection coatings
• 2" mounted filter with M48 × 0.75 thread
• SKU: PEG-FLTR-2M-S2
• filter size: 2"
• type: narrowband (7 nm)
• central wavelength: 672 nm
• transmission range: Tave > 80% at 672 nm, 7 nm FWHM
• polish: 1/4 wavefront, parfocal
• coatings: multilayer anti-reflection
• shape: round
• thickness: 5 mm (filter) + 2.5 mm (thread), glass thickness 2 mm
• thread: M48 × 0.75
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