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Baader Planetarium 1.25" Round S-II f/2 Highspeed Filter with LPFC Mount

SKU: AA2459395 MFR: FSIIHS-1
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Key Features

  • Capture stunning astrophotos with this 1.25" S-II narrowband filter, perfect for CCD imaging.
  • Experience maximum contrast on fast astrographs using this dielectrically coated Baader filter.
  • Reduce light pollution & enhance S-II transmission with this high-quality telescope filter.
  • Enjoy easy setup; this 1.25" round filter comes mounted in a Low Profile Filter Cell (LPFC).
  • The 2mm thick, plane optically polished filter ensures a durable build for long-term use.
  • Achieve optimal results with this 673nm CWL filter, designed for f/2 high-speed telescopes.
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Special Order?Estimated to Ship: 09/09/2025
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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

    S-II

  • Filter Thickness (without Cell)

    2mm

  • CWL (central Wavelength)

    673mm

  • AR-coating

    Dielectrically coated, plane optically polished

  • Special Functions

    Maximum Contrast for fast Astrographs

  • Filter Size

    1.25"

  • Visual/Imaging

    Imaging

  • Filter Usage

    CCD, f/2 High-speed, S-II

  • Filter Mounted

    Mounted (LPFC 6mm)

  • Type of Filter

    Narrowband

  • Filter Shape

    Round

  • Weight

    0.05kg (0.11lbs)

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

Overcome the challenges of astrophotography with the 1.25" Round S-II f/2 Highspeed Filter with LPFC Mount, a high-quality, durable, and innovative product from the reputable brand, Baader Planetarium. This effective and reliable filter is specifically designed to meet the intricate needs of extremely fast astrograph optics, such as Hyperstar and RASA.

Unlike conventional narrowband filters that often result in significant transmission loss due to strong CWL-shift, this filter features a CWL-preshift that perfectly aligns with f/2 to f/3 optics. This unique feature prevents the CWL from shifting out of the FWHM, even in extreme cases, ensuring optimal performance and image quality.

The filter's FWHM is meticulously optimized to deliver maximum contrast, despite the typical line broadening associated with fast optical trains. This makes it an ideal choice for capturing high contrast images of emission nebulae, even when using fast optics.

For photographers aiming to use optics between f/1.8 and f/3.5, this filter offers a dramatic improvement over regular sets of narrowband filters. It effectively blocks certain wavelengths of light and allows only specific ones to pass through, providing precise control over colors and contrast in your images.

Whether you're an astrophotographer aiming to capture detailed images of celestial objects or a professional photographer looking to achieve specific color effects or block unwanted light sources, the 1.25" Round S-II f/2 Highspeed Filter with LPFC Mount is a reliable and effective tool to enhance your photography experience.

Baader Planetarium Filter Features

  • Baader 1.25" f/2 Highspeed S II Filter
  • Permits the effective use of tremendously fast optics
  • Having high contrast imaging of emission nebulae for the first time
  • Highspeed Narrowband Filter, designed especially for the delicate requirements of extremely fast astrograph optics, in particular Hyperstar and RASA

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" S-II narrowband filter, perfect for CCD imaging.
  • Experience maximum contrast on fast astrographs using this dielectrically coated Baader filter.
  • Reduce light pollution & enhance S-II transmission with this high-quality telescope filter.
  • Enjoy easy setup; this 1.25" round filter comes mounted in a Low Profile Filter Cell (LPFC).
  • The 2mm thick, plane optically polished filter ensures a durable build for long-term use.
  • Achieve optimal results with this 673nm CWL filter, designed for f/2 high-speed telescopes.

What's in the box:

  • 1.25" Round S-II f/2 Highspeed Filter with LPFC Mount
  • Limited 2-Year Manufacturer Warranty