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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.
SVBONY CLS Light Pollution Filter
SVBONY CLS Light Pollution Broadband Filter
SVBONY CLS Light Pollution Broadband Filter
SVBONY CLS Light Pollution Broadband Filter
SVBONY CLS Light Pollution Broadband Filter
SVBONY CLS Light Pollution Filter

SVBONY CLS Light Pollution Broadband Filter

by SVBONY
SKU SV-F9155A
$22.07 - $52.55
$22.07
$22.07 - $52.55
$22.07
Price Match Policy!
  • Broadband Light Pollution Suppression
  • Effectively Blocks Sodium and Mercury Vapor Streetlights
  • High Transmission on Key Nebula Emission Lines
  • Optimized for Color Cameras and Unmodified DSLRs
  • Durable, Scratch-Resistant Optical Coatings
  • Available in 1.25", 2", and EOS-C Formats
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Svbony CLS Light Pollution Filter

    The Svbony CLS Filter is a broadband light pollution filter designed to dramatically increase the contrast of deep-sky objects when imaging from urban and suburban skies. By selectively blocking common sources of artificial skyglow, such as sodium and mercury vapor streetlights, it reveals faint nebula structures that would otherwise be lost. This filter is an essential tool for astrophotographers using color CCD cameras or unmodified DSLRs, isolating key emission wavelengths to make targets like the Orion Nebula (M42) stand out against a darker background.

    Svbony CLS: Suppressing Sodium & Mercury Vapor Skyglow

    The primary role of the Svbony CLS (City Light Suppression) filter is to reject the most common wavelengths of light pollution. It aggressively targets the spectral lines produced by sodium and mercury-vapor lamps, the dominant sources of skyglow in most urban environments. This selective blocking darkens the sky background in your images, significantly improving the signal-to-noise ratio. The practical result is that you can capture longer exposures from your backyard before the sensor is overwhelmed by skyglow, revealing fainter details in your target.

    Targeting Nebulae: Passing Hydrogen & Oxygen Emission Lines

    While blocking unwanted light, the Svbony CLS filter allows the most important wavelengths for deep-sky imaging to pass through to your camera sensor. It is designed for high transmission of critical emission lines, including Hydrogen-alpha, Hydrogen-beta, Oxygen-III, and Sulphur-II. Since these are the specific wavelengths emitted by popular targets like the North American Nebula (NGC 7000) and the Lagoon Nebula (M8), the filter makes these objects "pop" with enhanced contrast and color saturation, even with an unmodified DSLR.

    Advanced Coatings: Ion-Assisted Deposition for Longevity

    Svbony utilizes an advanced electron-beam gun evaporation process with ion-assisted deposition to create the filter's multi-layer coatings. This technology produces a dense, durable, and scratch-resistant surface that ensures consistent performance for years without degradation. A planetary rotation system during the coating process guarantees excellent homogeneity across the filter, providing uniform transmission and blockage for sharp, high-contrast images from edge to edge.

    Svbony CLS vs. UHC Filters: Choosing the Right Tool for Your Sky

    While both CLS and UHC (Ultra High Contrast) filters fight light pollution, they do so differently. A UHC filter is more aggressive, with a narrower passband focused almost exclusively on the Oxygen-III and Hydrogen-beta lines. This provides maximum contrast on planetary nebulae but can result in unnatural star colors.

    The Svbony CLS filter's broader passband is a more balanced approach. It allows more light through, which yields more natural star colors and performs better on broadband targets like galaxies and reflection nebulae. For imagers with color cameras seeking a versatile, all-purpose light pollution filter, the Svbony CLS is often the superior starting point.

  • How will the Svbony CLS filter improve my images of the Orion Nebula (M42) from my backyard?

    The Svbony CLS filter will darken the sky background, making the faint, outer regions of the Orion Nebula (M42) more visible against the sky. It passes the critical Hydrogen-alpha and Oxygen-III wavelengths that the nebula emits, which increases the contrast and color saturation of the nebula itself while suppressing the orange glow from city lights.

    I have an unmodified Canon DSLR. Is the Svbony CLS EOS-C filter a good choice?

    Yes, the EOS-C clip-in version is specifically designed for this purpose. An unmodified DSLR has a stock filter that blocks much of the red Hydrogen-alpha light. The Svbony CLS filter helps by increasing the contrast of all other nebula emission lines that your camera *can* see, making it a highly effective upgrade for imaging emission nebulae without modifying your camera.

    What is the main difference between this Svbony CLS filter and a UHC filter?

    The main difference is the width of the bandpass. The Svbony CLS filter is a broadband filter, allowing a wider range of light through, which results in more natural star colors and better views of broadband targets like galaxies. A UHC (Ultra High Contrast) filter has a much narrower bandpass, offering higher contrast on specific emission nebulae but at the cost of less natural colors.

    Will the Svbony CLS filter help with imaging galaxies like Andromeda (M31)?

    Yes, to an extent. Galaxies like Andromeda (M31) are broadband targets, meaning they emit light across the entire visible spectrum. The Svbony CLS filter helps by reducing the overall skyglow, which can improve contrast. However, because it also blocks parts of the galaxy's own light, the effect is less dramatic than on an emission nebula. It is still a major improvement over using no filter from a light-polluted location.

    Does the Svbony CLS filter change the color of stars in my images?

    Yes, any light pollution filter will introduce a color cast. The Svbony CLS filter produces a milder, typically blue-green cast compared to narrower filters. This is easily corrected during image processing with a proper white balance adjustment to restore natural star colors.

    How do I clean my Svbony CLS filter without damaging the coatings?

    First, use a rocket air blower to remove any loose dust or particles. If smudges remain, apply a few drops of a dedicated lens cleaning solution to a fresh, lint-free microfiber cloth or optical wipe. Gently wipe the filter in a circular motion from the center outwards. Never apply cleaning fluid directly to the filter itself.

  • Svbony 1-Year Warranty