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Baader Planetarium 31mm Round 4.5nm Ultra-Narrowband Oxygen-III CCD Imaging Filter, Unmounted

SKU: AAFIIINURD31 MFR: FOIIINU-RD31
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Key Features

  • Capture stunning astrophotos with this 31mm Oxygen-III CCD imaging filter, perfect for deep-sky objects.
  • Experience superior contrast with the ultra-narrowband filter, blocking unwanted light for clearer images.
  • Achieve pinpoint stars using this plane optically polished filter, designed for exceptional image quality.
  • This narrowband filter's 4.5nm bandwidth isolates the Oxygen-III line for breathtaking nebula details.
  • Enjoy durable performance with this dielectrically coated filter, ensuring long-lasting use in astrophotography.
  • Unmounted 31mm filter offers flexibility; use for CCD imaging, enhancing your telescope's capabilities.
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Special Order?Estimated to Ship: 10/18/2025
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Review Summary

2019-05-29T16:43:43

Rated 5 out of 5

The perfect mounting cell for eclipse photographers

AstroSolar film is the standard for white light solar filters. This mounting cell has two great advantages for eclipse photographers. The wide flange shades your camera avoiding overheating. The external 3 rubber bumper attachment is easy to remove and replace quickly without disturbing your aim. This is a great advantage for totality in a total solar eclipse. Highly recommended

Robert P.

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Baader Planetarium Filter Specifications

  • Transmission Range

    Oxygen-III

  • Filter Thickness

    2mm (without Cell)

  • Half Bandwidth

    4.5nm

  • Central Wavelength

    502nm

  • AR-coating

    Dielectrically coated, plane optically polished

  • Filter Size

    31mm

  • Filter Usage

    CCD, IR-Cut, O-III

  • Filter Mounted

    Unmounted

  • Type of Filter

    Narrowband

  • Filter Shape

    Round

  • Weight

    0.06kg (0.15 lbs)

About Baader Planetarium Filter

FEATURED REVIEWS

The perfect mounting cell for eclipse photographers

By Robert P.

AstroSolar film is the standard for white light solar filters. This mounting cell has two great advantages for eclipse photographers. The wide flange shades your camera avoiding overheating. The external 3 rubber bumper attachment is easy to remove and replace quickly without disturbing your aim. This is a great advantage for totality in a total solar eclipse. Highly recommended

Why settle for anything less than stellar clarity in your astrophotography pursuits The Baader Planetarium 31mm Round 4.5nm Ultra-Narrowband Oxygen-III CCD Imaging Filter represents the pinnacle of advanced optical engineering, offering a high-quality, durable solution for the discerning astrophotographer. This innovative filter is specifically designed for fast optical systems ranging from f/8 to f/3, ensuring compatibility with a wide range of CCD cameras.

Crafted with an ultra-narrow 4.5nm bandpass, this filter effectively isolates the Oxygen-III line at 500.7nm, which is paramount for capturing detailed images of nebulae and other astronomical phenomena. The narrow bandpass allows for the precise transmission of specific wavelengths of light, significantly enhancing contrast and detail in your images by reducing the effects of light pollution.

The Baader Planetarium's commitment to excellence is evident in the filter's construction. It features an IR-blocked design, ensuring that unwanted infrared light does not compromise your images. Additionally, the filter boasts a robust, non-ageing sealed coating on the edges, which prevents deterioration over time and maintains the filter's effectiveness and durability.

Photographers will appreciate the meticulous attention to detail that has gone into eliminating common optical issues. The filter is engineered to prevent halos, reflections, and ghosting, ensuring that your images remain clear and true to the celestial subjects you're capturing.

Choose the Baader Planetarium 31mm Round 4.5nm Ultra-Narrowband Oxygen-III CCD Imaging Filter for its unparalleled ability to deliver crisp, high-contrast images. Its innovative design and advanced technology make it an essential tool for any astrophotographer looking to elevate their imaging capabilities to new heights.

Baader Planetarium Filter Features

  • Advanced 31mm Round 4.5nm Ultra-Narrowband Oxygen-III CCD Imaging Filter for high-quality astrophotography
  • Designed for fast optical systems ranging from f/8 to f/3, compatible with a wide range of CCD cameras
  • Ultra-narrow bandpass isolates the Oxygen-III line at 500.7nm, enhancing image contrast and detail
  • IR-blocked design prevents unwanted infrared light from compromising image quality
  • Durable, non-ageing sealed coating edges for long-lasting performance
  • Engineered to eliminate halos, reflections, and ghosting for clear and true celestial imaging

Warranty Information

This product has a limited warranty of 24 months for parts and 24 months for labor.

Key Features

  • Capture stunning astrophotos with this 31mm Oxygen-III CCD imaging filter, perfect for deep-sky objects.
  • Experience superior contrast with the ultra-narrowband filter, blocking unwanted light for clearer images.
  • Achieve pinpoint stars using this plane optically polished filter, designed for exceptional image quality.
  • This narrowband filter's 4.5nm bandwidth isolates the Oxygen-III line for breathtaking nebula details.
  • Enjoy durable performance with this dielectrically coated filter, ensuring long-lasting use in astrophotography.
  • Unmounted 31mm filter offers flexibility; use for CCD imaging, enhancing your telescope's capabilities.

What's in the box:

  • Baader Planetarium 31mm Round 4.5nm Ultra-Narrowband Oxygen-III CCD Imaging Filter
  • Stackable Filter Box
  • Baader Planetarium 2 Year Limited Warranty