OIII-CCD 12nm Deep Sky Imaging Filter 2" M48
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    • OIII-CCD 12nm Deep Sky Imaging Filter 2" M48

    Optolong OIII 25nm 2" Mounted Filter

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    Optolong OIII 25nm 2" Mounted Filter

    Visual-use OIII filter designed to enhance nebula observation. Best with 6”+ telescopes even under light-polluted skies.

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    Optolong OIII 25nm 2" Mounted Filter

    DESCRIPTION

    The Optolong 2" OIII 25nm filter is specifically designed for visual observation of nebulae, including emission, planetary and supernova remnants. It enhances contrast by transmitting a narrow band centered at 500 nm while blocking unwanted light pollution and irrelevant wavelengths. It is most effective with telescopes of 6 inches or more in aperture.

    Constructed from precision-polished Schott B260 optical glass, this filter uses a multilayer anti-reflection coating applied via ion-assisted deposition. Its CNC-machined anodized metal cell is ultra-thin and threaded, offering a wide clear aperture of 45 mm for optimal light transmission.

    TECHNICAL SPECIFICATIONS

    • Type: OIII narrowband interference filter

    • Intended use: visual observation only

    • Bandwidth: 25 nm centered at 500 nm

    • Transmission: 90% at 495.9 & 500.7 nm

    • Blocking: <0.1% at 435, 578, 589 nm

    • Glass: 2 mm Schott B260

    • Coating: multilayer AR, ion-assisted deposition

    • Polishing: 1/4 wave, <30" parallelism

    • Housing: CNC machined, anodized black, threaded

    • Diameter: 2" (50.8 mm), 45 mm clear aperture

    • Shape: round

    • Model: OIII-200

    • Brand: Optolong

    • Included: plastic case with EVA lining

    OPTOLONG OIII Visual 2"
    Available.