Baader S-II 2" unmounted f/2 Highspeed Filter 6.5 nm CMOS optimized (2961303U)
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    • Baader S-II 2" unmounted f/2 Highspeed Filter 6.5 nm CMOS optimized (2961303U)
    • Baader S-II 2" unmounted f/2 Highspeed Filter 6.5 nm CMOS optimized (2961303U)
    • Baader S-II 2" unmounted f/2 Highspeed Filter 6.5 nm CMOS optimized (2961303U)

    Baader S-II 2" unmounted f/2 Highspeed Filter 6.5 nm CMOS optimized (2961303U)

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    Baader S-II 2" unmounted f/2 Highspeed Filter 6.5 nm CMOS optimized (2961303U)

    Baader S-II 2" (47.4 mm) unmounted filter, CMOS and CCD optimized. Designed for ultra-fast f/2 systems such as Celestron RASA. 6.5 nm bandwidth, Reflex-Blocker™ Life-Coat™ coating.

    Quantity
    In stock at the supplier. For delivery time and for shipping outside Switzerland, please contact us.

    Baader S-II 2" unmounted f/2 Highspeed Filter 6.5 nm CMOS optimized (2961303U)

    Description

    The Baader S-II 2" unmounted (Ø 47.4 mm, 2 mm thick) f/2 Highspeed Filter 6.5 nm is designed for extremely fast optical systems like the Celestron RASA f/2 astrographs. It is specially selected for Baader FCCT (Filter Changer Camera Tilter) filter sliders, compatible with QHY cameras and other versions.

    Optimized for CMOS sensors, it also performs excellently with CCD cameras. With a central wavelength of 671.7 nm and a 6.5 nm bandwidth, this filter isolates the sulfur-II emission line (S-II), making it essential for narrowband imaging and SHO (Hubble) palette astrophotography.

    Featuring precision planeoptical polishing and Reflex-Blocker™ hard coating, it minimizes stray reflections. Blackened edges with telescope-side indicator ensure correct orientation, while Life-Coat™ sealed protection guarantees long-term durability. Lightweight (0.01 kg) and robust, this filter is sold individually and provides outstanding performance in S-II astrophotography with ultra-fast optics.

    Technical Specifications

    • Manufacturer: Baader Planetarium

    • Product SKU: 2961303U

    • EAN code: 4047825050991

    • Net weight: 0.01 kg

    • Filter type: S-II f/2 Highspeed

    • Mount: unmounted

    • Shape: round

    • Diameter: 47.4 mm (2" without cell)

    • Thickness: 2 mm

    • Central wavelength (CWL): 671.7 nm

    • Half bandwidth (HBW / FWHM): 6.5 nm

    • Transmission: S-II line

    • Coating: Reflex-Blocker™ hard coated, planeoptically polished

    • Durability: Life-Coat™ sealed edges

    • Edges: blackened with telescope-side indicator

    • Suitable f/ratio: f/3.4 and faster

    • Compatibility: Celestron RASA 8", Baader FCCT, QHY cameras, CMOS and CCD

    • Application: S-II astrophotography, nebulae, SHO palette, deep-sky imaging

    • Packaging: single filter

    Baader S-II 2" f/2 HS 6.5nm

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