Baader O-III 2" unmounted f/2 Highspeed Filter 4 nm CMOS optimized (2961453U)
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    • Baader O-III 2" unmounted f/2 Highspeed Filter 4 nm CMOS optimized (2961453U)
    • Baader O-III 2" unmounted f/2 Highspeed Filter 4 nm CMOS optimized (2961453U)
    • Baader O-III 2" unmounted f/2 Highspeed Filter 4 nm CMOS optimized (2961453U)

    Baader O-III 2" unmounted f/2 Highspeed Filter 4 nm CMOS optimized (2961453U)

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    Baader O-III 2" unmounted f/2 Highspeed Filter 4 nm CMOS optimized (2961453U)

    Baader O-III 2" (47.4 mm) unmounted filter, CMOS and CCD optimized. Designed for ultra-fast < f/2.3 systems such as Celestron RASA. 4 nm bandwidth, ideal under strong light pollution.

    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 O-III 2" unmounted f/2 Highspeed Filter 4 nm CMOS optimized (2961453U)

    Description

    The Baader O-III 2" unmounted (Ø 47.4 mm, 2 mm thick) f/2 Highspeed Filter 4 nm is designed for extremely fast optical systems such as the Celestron RASA f/2 astrographs. It is specially selected for Baader FCCT (Filter Changer Camera Tilter) filter sliders, compatible with QHY cameras and similar models.

    Optimized for CMOS sensors, it also performs excellently with CCD technology. With a central wavelength of 500.7 nm and a 4 nm bandwidth, it isolates the O-III emission line, providing maximum contrast even under strong light pollution (Bortle 9 to 6). It reduces star size and highlights the finest nebula details in O-III astrophotography.

    Featuring precision planeoptical polishing and Reflex-Blocker™ hard coating, it minimizes unwanted reflections. Blackened edges with telescope-side indicator ensure proper orientation, while Life-Coat™ sealed protection guarantees long-term durability. Lightweight (0.01 kg) and robust, it is sold individually and is indispensable for high-speed O-III astrophotography.

    Technical Specifications

    • Manufacturer: Baader Planetarium

    • Product SKU: 2961453U

    • EAN code: 4047825051011

    • Net weight: 0.01 kg

    • Filter type: O-III f/2 Ultra Highspeed

    • Mount: unmounted

    • Shape: round

    • Diameter: 47.4 mm (2" without cell)

    • Thickness: 2 mm

    • Central wavelength (CWL): 500.7 nm

    • Half bandwidth (HBW / FWHM): 4 nm

    • Transmission: O-III line

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

    • Durability: Life-Coat™ sealed edges

    • Edges: blackened with telescope-side indicator

    • Suitable f/ratio: < f/2.3

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

    • Application: O-III astrophotography, nebulae, light-polluted skies

    • Packaging: single filter

    Baader O-III 2" f/2 UHS 4nm