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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 U-Venus Filter - 350nm
Baader U-Venus Filter - 350nm
Baader U-Venus Filter - 350nm
Baader U-Venus Filter - 350nm
Baader U-Venus Filter - 350nm

Baader U-Venus Filter - 350nm

by Baader Planetarium
SKU BAA-2458292
$332.00 - $434.00
$332.00
$332.00 - $434.00
$332.00
Price Match Policy!
  • 350nm Central Wavelength
  • 60nm Bandwidth (320-380nm)
  • ~80% Peak Transmission
  • Blocks Visible and IR light from 200nm to 1120nm
  • Dielectric Multi-Coated Schott Glass
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  • Description
  • FAQ
  • Specifications
  • In the Box
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  • Warranty

  • Baader U-Venus Filter - 350nm

    The Baader U-Venus Filter isolates a specific 60nm bandpass centered on 350nm, designed to reveal the high-contrast cloud structures of the Venusian atmosphere otherwise invisible to the eye. It achieves approximately 80% peak transmission within its 320-380nm window while completely blocking the entire visual and infrared spectrum from 200nm to 1120nm, ensuring only pure ultraviolet data reaches your sensor.

    Isolating Venus's Atmosphere: The 350nm UV Window

    In visible light, Venus presents as a brilliant, featureless white disc due to its dense, highly reflective cloud deck. However, at the deep ultraviolet wavelength of 350nm, atmospheric chemicals like sulfur dioxide absorb sunlight, creating dark, dynamic patterns. The Baader U-Venus filter precisely targets this 350nm window, transforming the planet from a blank canvas into a world of swirling clouds and complex weather systems for your camera to capture.

    Advanced Coatings for 80% Transmission and Deep Blocking

    This filter's effectiveness comes from its advanced dielectric multi-coatings, applied to an optically polished Schott glass substrate. These coatings deliver a high peak transmission of approximately 80% within the narrow 60nm passband. Critically, the filter provides complete blocking of all other wavelengths from 200nm up to 1120nm, eliminating contamination from visible and near-infrared light that would otherwise overwhelm the faint UV signal and wash out delicate cloud details.

    Imaging Venus with a 5" Telescope and UV-Sensitive Camera

    Imaging in the deep UV is a demanding technique that requires a specific equipment setup. The Baader U-Venus filter is not a visual accessory; it is designed for use with a monochrome astronomy camera that has high sensitivity in the ultraviolet spectrum. Due to the dimness of the UV signal, a telescope with a minimum aperture of 5 inches is required, though an 8-inch or larger instrument is strongly recommended to achieve a bright enough image for the short exposures used in lucky imaging.

  • Why is the Baader U-Venus filter centered at 350nm for imaging Venus?

    Venus's surface is hidden by a uniform, highly reflective cloud deck in visible light. At 350nm in the deep ultraviolet, specific chemicals in the atmosphere absorb sunlight, creating dark, high-contrast patterns. This allows imagers to capture the dynamic cloud structures and weather systems that are otherwise completely invisible.

    What kind of camera do I need for the Baader U-Venus 350nm filter?

    You must use a monochrome imaging camera with high sensitivity in the ultraviolet spectrum. Standard color cameras have internal filters that block UV light, and many older mono cameras have low UV quantum efficiency. Modern mono CMOS sensors are generally the best choice for this application.

    Can I see Venus's clouds visually with the Baader U-Venus filter?

    No. The human eye is not sensitive to the 320-380nm wavelengths passed by this filter. It is designed exclusively for photographic and electronic imaging with UV-sensitive cameras.

    Will the Baader U-Venus 350nm filter work with my 4" refractor?

    While you might record a faint signal, it is not recommended. Successful UV imaging requires significant light-gathering power. Baader recommends a minimum aperture of 5 inches, with 8 inches or more being ideal to achieve a bright enough image for lucky imaging techniques and to overcome the dimness of the UV signal.

    How does the deep blocking from 200nm to 1120nm improve images with the Baader U-Venus filter?

    By completely blocking all visible and near-infrared light, the filter ensures that only the desired 350nm UV signal reaches the sensor. This prevents longer wavelengths from "leaking" through and washing out the faint UV cloud details, which dramatically increases contrast and reveals subtle atmospheric features.

    Can I use the Baader U-Venus 350nm filter for deep-sky objects?

    This is not its intended purpose. While some specialized research involves UV imaging of reflection nebulae or specific star types, the vast majority of deep-sky objects are extremely dim in the UV. This filter is highly optimized for imaging the solar system's brightest inner planet, Venus.

  • Available Sizes 1.25" & 2" Round Mounted
    Central Wavelength (CWL) 350nm
    Bandwidth (FWHM) 60nm (320nm - 380nm)
    Peak Transmission ~80%
    Blocking Range 200nm - 1120nm
    Substrate Optically Polished Schott Glass
    Coatings Dielectric Multi-Coating
    Net weight (kg) 0.01
    Single or Set? Single Filter
    Filter mounted Mounted (LPFC 6mm)
    Filter Usage Specialty, UV-Pass
    Type of Filter Narrowband
    Filter Thickness (without cell) 1 mm
    Transmission Range UV
    AR-Coating dielectrically coated, planeoptically polished

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  • Baader Planetarium Warranty