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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Baader Methane Filter 889nm - 8nm 1.25"
Baader Methane Filter 889nm - 8nm 1.25"
Baader Methane Filter 889nm - 8nm 1.25"
Baader Methane Filter 889nm - 8nm 1.25"

Baader Methane Filter 889nm - 8nm 1.25"

by Baader Planetarium
SKU BAA-2458295
$300.00 - $300.00
$300.00
$300.00 - $300.00
$300.00
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  • 889nm Center Wavelength
  • 8nm Bandwidth (FWHM)
  • Targets Methane Absorption Band
  • High-Contrast Planetary Imaging
  • 1.25" Filter Format
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  • Description
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  • Baader Methane Filter 889nm - 8nm 1.25"

    The Baader Methane Filter isolates a narrow 8nm bandpass centered at 889nm, a specific near-infrared wavelength designed for 1.25" filter wheels to reveal high-altitude structures in the methane-rich atmospheres of Jupiter and Saturn. This filter transforms your view of gas giants from a simple color image into a scientific tool, creating high-contrast monochrome data that highlights features invisible in the visible spectrum.

    Planetary Science: Imaging Jupiter and Saturn in the 889nm Methane Band

    The 889nm wavelength is significant because it corresponds to a strong methane absorption band. When you image a gas giant through this filter, the deep atmospheric layers rich in methane gas absorb this light and appear dark. Conversely, high-altitude clouds, storms, and hazes that sit above the main methane layer reflect sunlight and appear brilliantly bright, creating a stark, high-contrast image.

    On Jupiter, this effect makes the Equatorial Zone and the Great Red Spot (GRS) stand out with dramatic clarity. For Saturn, you can capture details in its banded structure and detect seasonal polar storms that are otherwise washed out by the planet's muted visible-light appearance. This is not just a different view; it's a method for mapping the vertical structure of a planet's atmosphere.

    Imaging Technique: The Demands of an 8nm Near-Infrared Bandpass

    Using the Baader Methane Filter requires a specific approach. Because it isolates a tight 8nm bandpass in the near-infrared—where silicon sensors are less sensitive—you will need longer exposure times or higher gain settings than with a standard luminance or IR-pass filter. This makes the filter best suited for telescopes with larger apertures that can gather sufficient light.

    • Monochrome Camera Required: This is a scientific filter designed for use with a monochrome astronomy camera to capture a detailed luminance layer. A color camera's Bayer matrix would block most of the incoming light and produce a very weak, unusable signal.
    • Seeing is Critical: The longer required exposures make this filter sensitive to atmospheric turbulence. For the best results, you should use it on nights of good to excellent seeing to resolve the fine details it's capable of revealing.
    • Data Integration: The methane-band image is typically captured as a separate channel and can be colorized with RGB data to create a final composite that shows both the scientific detail from the 889nm band and the natural color of the planet.

  • How will the Baader Methane Filter make Jupiter's Great Red Spot appear?

    Jupiter's Great Red Spot (GRS) is a high-altitude storm system. Because it sits above much of the planet's atmospheric methane, it will reflect sunlight at 889nm and appear very bright through the Baader Methane Filter, standing out in high contrast against the darker, methane-absorbing cloud belts surrounding it.

    Can I use the Baader Methane Filter with a color camera?

    No, this filter is not recommended for color cameras. The Baader Methane Filter isolates a very narrow 8nm band of near-infrared light at 889nm. A color camera's Bayer matrix would block approximately 75% of this already-dim signal, resulting in extremely low efficiency and poor image quality. A monochrome camera is required.

    Why is the Baader Methane Filter centered on the 889nm wavelength?

    The 889nm wavelength corresponds to a strong absorption line for methane gas. By imaging specifically at this wavelength, the Baader Methane Filter allows astronomers to differentiate between deep, methane-rich atmospheric layers (which appear dark) and high-altitude features like clouds and storms (which appear bright).

    What kind of telescope works best with the Baader Methane Filter?

    Because the filter has a narrow 8nm bandpass in the near-IR, it passes a limited amount of light. For this reason, the Baader Methane Filter performs best with larger aperture telescopes (typically 8" or more) that have greater light-gathering power. This helps to keep exposure times manageable and achieve a better signal-to-noise ratio.

    What is the purpose of the narrow 8nm bandpass on the Baader Methane Filter?

    The narrow 8nm bandpass ensures that only light from the specific methane absorption band is recorded. This precision increases contrast by rejecting adjacent infrared wavelengths, darkening the methane-rich areas more effectively and making the high-altitude features stand out more sharply.

    Will the Baader Methane Filter help with imaging Mars or the Moon?

    No, this filter is highly specialized for the methane-rich atmospheres of gas giants like Jupiter and Saturn. Mars has a very thin atmosphere with negligible methane, and the Moon has no atmosphere at all. Using the Baader Methane Filter on these targets would only produce a very dim, low-contrast infrared image with no scientific benefit.

  • Filter Type Bandpass
    Center Wavelength 889nm
    Bandwidth (FWHM) 8nm
    Size 1.25"
    Primary Application Planetary Imaging (Gas Giants)
    Net weight (kg) 0.01
    Filter shape round
    Single or Set? Single Filter
    Filter mounted Mounted (LPFC 6mm)
    Filter Usage CCD, Planetary, Specialty
    Filter Thickness (without cell) 2 mm
    Transmission Range Methan
    AR-Coating dielectrically coated, planeoptically polished

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