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.

    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