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.

    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

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