Baader Planetarium 4.5nm Sulfur-II Ultra-Narrowband CCD Filter, 65mm Square, Unmounted

SKU: AAFSIINUSQ65 MFR: FSIINU-SQ65
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Key Features

  • Capture stunning nebula details with this 65mm square Sulfur-II narrowband filter.
  • Experience superior light pollution reduction with Baader Planetarium's advanced filter tech.
  • Achieve optimal S-II transmission rate for breathtaking astrophotography results every time.
  • Boasting a durable build, this 65mm filter ensures years of reliable astronomical use.
  • Enjoy exceptional color correction, enhancing your CCD images with vibrant clarity.
  • Thread this unmounted filter into your telescope for enhanced S-II narrowband imaging.
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Special Order?Estimated to Ship: 08/19/2025
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Baader Planetarium Narrowband Filter Specifications

  • Transmission range

    S-II

  • Filter thickness (without cell)

    2mm / 3mm

  • HBW (half bandwidth)

    4.5nm

  • CWL (central wavelength)

    673 nm

  • AR-coating

    Dielectrically coated, plane-optically polished

  • Filter usage

    CCD, IR-Cut, S-II

  • Filter mounted

    Unmounted

  • Filter Size

    65mm

  • Weight

    0.07kg (0.15 lbs)

About Baader Planetarium Narrowband Filter

Enhance your astrophotography experience with the high-quality 4.5nm Sulfur-II Ultra-Narrowband CCD Filter, meticulously crafted by the renowned Baader Planetarium. This durable and effective 65mm square, unmounted filter is engineered to elevate your deep-sky imaging, capturing the intricate details of celestial wonders.

The innovative design of this filter is optimized for fast optical systems with focal ratios ranging from f/3 to f/8, ensuring compatibility with a wide array of telescopes. Its ultra-narrow 4.5nm bandwidth is specifically tailored for S-II (Sulfur-II) line astrophotography, making it a reliable choice for enthusiasts seeking to isolate specific wavelengths and enhance the visibility of nebulae and other astronomical phenomena.

Constructed with IR-blocking capabilities, this filter safeguards your images from unwanted infrared interference. The advanced anti-reflection coatings applied to the filter work to eliminate distracting halos and ghosting, providing you with crisp, clear astrophotographs that truly showcase the beauty of the night sky.

Furthermore, the filter boasts non-ageing sealed coated edges, a testament to its long-lasting durability. This feature ensures that the filter remains protected against the elements, maintaining its high performance and image quality over time.

Choose the Baader 4.5nm Sulfur-II Ultra-Narrowband CCD Filter for its unparalleled precision and the ability to bring out the subtlest details in your astrophotography pursuits. Whether you're capturing the complex structures of a distant nebula or the delicate filaments of a supernova remnant, this filter is the astrophotographer's essential tool for achieving breathtaking results.

Baader Planetarium Narrowband Filter Features

  • For fast optical systems from f / 8 to f / 3
  • Reflection-free, anti-reflective and smooth-surfaced
  • IR-blocked
  • NO halos, NO reflections, NO ghosting
  • Non-ageing sealed coating edges

Warranty Information

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

Key Features

  • Capture stunning nebula details with this 65mm square Sulfur-II narrowband filter.
  • Experience superior light pollution reduction with Baader Planetarium's advanced filter tech.
  • Achieve optimal S-II transmission rate for breathtaking astrophotography results every time.
  • Boasting a durable build, this 65mm filter ensures years of reliable astronomical use.
  • Enjoy exceptional color correction, enhancing your CCD images with vibrant clarity.
  • Thread this unmounted filter into your telescope for enhanced S-II narrowband imaging.

What's in the box:

  • Baader Planetarium 4.5nm Sulfur-II Ultra-Narrowband CCD Filter (65mm Square)
  • Alpine Astronomical Baader Stackable Filter Box
  • Baader Planetarium 2 Year Limited Warranty