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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.
Optolong CLS-CCD Light Pollution Filter
Optolong CLS-CCD Light Pollution Filter
Optolong CLS-CCD Light Pollution Filter
Optolong CLS-CCD Light Pollution Filter
Optolong CLS-CCD Light Pollution Filter
Optolong CLS-CCD Light Pollution Filter
Optolong CLS-CCD Light Pollution Filter

Optolong CLS-CCD Light Pollution Filter

par Optolong
UGC OPT-11901
$95.00 - $159.00
$95.00
$95.00 - $159.00
$95.00
Égalisation de prix!
  • Blocks >99% of primary light pollution emission lines
  • Achieves >90% average transmission on key nebula wavelengths
  • Integrated 300-1100nm UV/IR cut filter for color cameras
  • λ/4 transmitted wavefront and 30s parallelism for sharp stars
  • 1.85mm thick optical glass substrate
En rupture temporaire
Alerte de retour en stock
Info disponibilité
Admissible à la livraison GRATUITE aux USA pour les commandes de plus de 350$.
  • Description
  • FAQ
  • Specifications
  • Warranty

  • Optolong CLS-CCD Light Pollution Filter

    The Optolong CLS-CCD Light Pollution Filter is engineered to reclaim contrast in your astrophotos by blocking over 99% of common light pollution sources while maintaining an average transmission greater than 90% on critical nebula emission lines. Its integrated 300-1100nm blocking range makes it a single-filter solution for color CCD and modified DSLR cameras, eliminating star bloat from infrared without needing a separate IR-cut filter. The 1.85mm optical glass substrate is polished to a λ/4 transmitted wavefront, ensuring your system's resolution is not compromised.

    Blocking >99% of Sodium and Mercury Vapor Lines

    This filter's primary function is to surgically remove the wavelengths associated with urban skyglow. It achieves a blocking depth of over 99% for mercury vapor, high-pressure sodium, and low-pressure sodium vapor lamps—the most common sources of artificial light pollution. By rejecting this unwanted light, the background sky in your images becomes significantly darker, allowing the faint, complex structures of nebulae to stand out.

    Over 90% Transmission on H-alpha, OIII, and SII

    While aggressively blocking pollutants, the CLS-CCD maintains an average transmission rate (Tave) of over 90% across the most important emission lines for deep-sky objects. This high throughput applies to hydrogen-alpha (656nm), oxygen-III (496nm and 500nm), hydrogen-beta (486nm), and sulfur-II (672nm). The result is vibrant, high-contrast images of emission nebulae, planetary nebulae, and supernova remnants, with their natural colors preserved.

    The CCD Advantage: Integrated 300-1100nm IR/UV Cut for Color Sensors

    The "CCD" in the name signifies a critical feature: a built-in UV and IR cut filter covering a wide 300-1100nm range. Many color astronomy cameras and modified DSLRs have sensors that are sensitive to infrared light, which can cause bloated, unfocused stars if not filtered out. The CLS-CCD eliminates the need for a separate L-filter (luminance/IR-cut), simplifying your imaging train and ensuring sharp, tight stars across the frame.

    CLS-CCD vs. Standard CLS: Why IR Cut Matters

    The key difference between the Optolong CLS-CCD and the standard visual CLS filter is the infrared blocking. While both filters suppress the same light pollution lines, the standard CLS allows infrared light to pass through. This makes it suitable for visual use or for monochrome cameras shooting with a separate filter wheel.

    • Choose the CLS-CCD if: You use a one-shot-color (OSC) camera, a color CCD, or a modified DSLR. The integrated IR-cut is essential for preventing star bloat and achieving correct color balance without an extra filter.
    • Choose the standard CLS if: You are a visual observer or use a monochrome camera with a separate IR-cut filter in your luminance (L) channel.

  • What is the main difference between the Optolong CLS-CCD and the standard CLS filter?

    The Optolong CLS-CCD includes an integrated IR/UV cut filter that blocks wavelengths from 300-1100nm. This is essential for color cameras (OSC/DSLR) to prevent star bloat from infrared light. The standard CLS filter does not block IR and is intended more for visual use or monochrome imaging setups that use a separate luminance filter.

    Can I use the Optolong CLS-CCD filter for visual observing?

    While you can, it's not ideal. The filter's transmission characteristics are optimized for the response of a digital sensor. For visual use, the standard Optolong CLS filter typically provides a brighter, more natural-looking view through the eyepiece.

    Will the Optolong CLS-CCD filter work with my unmodified DSLR camera?

    Yes, but with limited effectiveness for certain objects. An unmodified DSLR has its own internal filter that blocks most of the deep red H-alpha light (656nm). The CLS-CCD will still improve contrast by blocking skyglow, but to capture the rich red nebulosity in objects like the North America Nebula (NGC 7000), a "modified" DSLR with the stock filter removed is required.

    How will the CLS-CCD filter affect imaging the Orion Nebula (M42) from a city?

    For an object like the Orion Nebula (M42), the CLS-CCD filter will dramatically improve your results from a light-polluted area. It will darken the sky background, significantly increasing the contrast of the glowing hydrogen and oxygen gases that make up the nebula. This allows you to capture much more of the faint, extended nebulosity without the image being washed out by city lights.

    Is the Optolong CLS-CCD a good choice for imaging galaxies like Andromeda (M31)?

    It's a trade-off. Galaxies like the Andromeda Galaxy (M31) are broadband objects, meaning they emit light across the entire visible spectrum, similar to stars. A light pollution filter like the CLS-CCD will block some of the galaxy's own light along with the skyglow. While it can help darken the background, it may also alter the galaxy's natural color balance. For galaxies, less aggressive filters or simply capturing more data from a dark site is often the preferred approach.

    Can I use the Optolong CLS-CCD filter to look at the Sun?

    Absolutely not. The Optolong CLS-CCD filter is NOT a solar filter and is not designed for sun observation. Looking at the Sun with this filter, or any filter not explicitly designed for safe solar viewing, will cause immediate and permanent eye damage, including blindness. Always use a certified safe solar filter that covers the entire front aperture of your telescope.

  • Filter Type Broadband Light Pollution (LP) Filter with IR/UV Cut
    Available Sizes 1.25" Mounted, 2" Mounted
    Substrate Material Optical glass
    Substrate Thickness 1.85mm
    Average Transmission >90%
    Blocking Range 300-1100nm
    Light Pollution Blocking >99%
    Surface Quality 60/40
    Transmitted Wavefront RMS λ/4
    Parallelism 30s
  • Optolong 3-Year Warranty