OPTOLONG - SII CCD 6.5NM FILTER - 36MM UNMOUNTED
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    • OPTOLONG - SII CCD 6.5NM FILTER - 36MM UNMOUNTED

    Optolong SII 6.5nm unmounted filter 36 mm

    199.00
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    Optolong SII 6.5nm unmounted filter 36 mm

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    Optolong SII 6.5nm unmounted filter 36 mm

    DESCRIPTION
    The Optolong SII 6.5 nm unmounted filter (36 mm) is designed for narrowband imaging of nebulae in the ionized sulfur emission line (SII). It transmits a 6.5 nm wide band centered at 672 nm while effectively blocking unwanted light from artificial sources such as mercury vapor, high and low-pressure sodium lamps, and atmospheric oxygen emission (skyglow).

    This filter is ideal for imaging faint emission objects even under full moon or light-polluted urban skies. It is commonly used with H-alpha and OIII filters to create SHO compositions. It enhances contrast between the nebula and the sky background without increasing object brightness.

    TECHNICAL SHEET

    • Manufacturer: Optolong

    • Type: Narrowband interference filter – SII

    • Bandwidth: 6.5 nm

    • Central wavelength (CWL): 672 nm

    • Format: 36 mm round, unmounted

    • Application: CCD/CMOS narrowband imaging

    • Emission line: SII (ionized sulfur)

    • Transmission: High at passband, strong off-band blocking

    • Recommended use:

      • Emission nebulae

      • Supernova remnants

      • Narrowband imaging under moonlight or light pollution

      • SHO palette with H-alpha and OIII filters

    • Suitable environment: Urban skies, full moon

    Optolong SII 6.5 nm 36 mm