Baader Planetarium 4.5nm Sulfur-II Ultra-Narrowband CCD Filter, 1.25" Eyepiece

SKU: AAFSIINU1 MFR: FSIINU-1
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Key Features

  • Capture stunning astrophotos with this 1.25" Sulfur-II Ultra-Narrowband CCD Filter.
  • Enhance image contrast of nebulae by blocking unwanted light with this filter.
  • Achieve exceptional 4.5nm transmission range for detailed S-II wavelength imaging.
  • Minimize light pollution and maximize your telescope's performance with ease.
  • Enjoy plane-optically polished filters that are dielectrically AR-coated for clarity.
  • Stackable filter box keeps your 1.25" eyepiece filters safe and organized for travel.
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Special Order?Estimated to Ship: 09/07/2025
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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

    Mounted

  • Filter Size

    1.25" Eyepiece

  • Weight

    0.07kg (0.15 lbs)

About Baader Planetarium Narrowband Filter

It is designed for the discerning astrophotographer seeking to elevate their imaging capabilities, this high-quality 4.5nm Baader Sulfur-II (S-II) Ultra-Narrowband CCD Filter is an essential tool for capturing the intricate details of the cosmos. Engineered to work seamlessly with fast optical systems boasting focal ratios from f/3 to f/8, this advanced filter is meticulously crafted to ensure the highest level of light transmission at the S-II line at 672nm.

The durable construction of the filter incorporates IR blocking to prevent infrared light from blurring your images, while the innovative anti-reflection coatings are applied to minimize unwanted halos and ghosting effects. This results in astrophotography images that are crisp, clear, and rich in contrast.

With its effective narrowband s-ii designation, this filter is particularly adept at isolating the light emitted by ionized sulfur in nebulae or other astronomical phenomena, allowing for precise control over the light spectrum. This specificity makes it a powerful accessory for capturing detailed and accurate images that would otherwise be obscured by broader spectrum filters.

The filter also boasts non-ageing sealed coated edges, a testament to its durable and long-lasting design. These edges ensure that the filter remains protected from the elements, maintaining its performance and optical quality over time.

Whether you're a professional astronomer or an amateur enthusiast, the Baader Sulfur-II Ultra-Narrowband CCD Filter is an innovative and effective choice for enhancing your astrophotography experience. Its advanced features and superior construction make it a standout selection for anyone looking to capture the beauty of the night sky with unparalleled clarity and detail.

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 astrophotos with this 1.25" Sulfur-II Ultra-Narrowband CCD Filter.
  • Enhance image contrast of nebulae by blocking unwanted light with this filter.
  • Achieve exceptional 4.5nm transmission range for detailed S-II wavelength imaging.
  • Minimize light pollution and maximize your telescope's performance with ease.
  • Enjoy plane-optically polished filters that are dielectrically AR-coated for clarity.
  • Stackable filter box keeps your 1.25" eyepiece filters safe and organized for travel.

What's in the box:

  • Baader Planetarium 4.5nm Sulfur-II Ultra-Narrowband CCD Filter (1.25 " Eyepiece)
  • Alpine Astronomical Baader Stackable Filter Box
  • Baader Planetarium 2 Year Limited Warranty