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Optolong L-Para HA/OIII 10nm Filter - 2"

Optolong L-Para HA/OIII 10nm Filter - 2"

par Optolong
UGC OPT-AS100221
CA$362.00 - CA$362.00
CA$362.00
CA$362.00 - CA$362.00
CA$362.00
Égalisation de prix!
  • Dual Narrowband H-Alpha & OIII Filter
  • Suppresses Mercury, Sodium & LED Light Pollution
  • Optimized for Fast-Ratio Systems (RASA, HyperStar)
  • Advanced Anti-Halo Optical Design
  • Durable Ion-Assisted Deposition Coatings
5 en stock
Admissible à la livraison GRATUITE au Canada pour les commandes de plus de 500$.
  • Description
  • FAQ
  • Warranty

  • Optolong L-Para HA/OIII 10nm Filter - 2"

    The Optolong L-Para HA/OIII filter is a dual narrowband filter designed to isolate critical nebula emission lines from hydrogen-alpha and oxygen-III. It aggressively suppresses common sources of urban light pollution, including mercury-vapor, sodium, and LED streetlights. This targeted filtration darkens the sky background, significantly increasing the contrast of emission nebulae for more detailed and vibrant astrophotography.

    Dual-Bandpass Design for High-Contrast Nebula Imaging

    The L-Para filter targets the two most prominent emission lines in most nebulae—Hydrogen-alpha and Oxygen-III. By selectively passing light from these wavelengths while rejecting the rest of the spectrum, it renders the sky background exceptionally dark. This approach dramatically enhances the contrast between your deep-sky target and the surrounding sky, revealing faint structures that would otherwise be lost to light pollution.

    Universal Compatibility: Engineered for Fast and Standard Telescopes

    A key design goal for the L-Para was compatibility across a wide range of instruments. It is engineered to maintain high transmission rates and color fidelity not only in standard focal ratio telescopes but also in very fast optical systems like RASA or HyperStar setups. The filter's performance holds up even when receiving steep, oblique light rays, ensuring one filter can serve your entire collection of telescopes without compromise.

    Advanced Halo Suppression for Cleaner Stars

    Halos around bright stars can obscure faint, nearby nebulosity and detract from the final image. The Optolong L-Para features an optimized coating stack specifically designed to minimize these artifacts. This meticulous anti-halo engineering results in cleaner, more precise star images and ensures that the delicate details of your target nebula remain the central focus.

    Durable Ion-Assisted Coatings for Lasting Reliability

    Optolong utilizes an ion-assisted deposition coating process to produce the L-Para filter. This advanced technique creates a hard, dense coating that is highly resistant to scratching and environmental degradation. The result is a filter with stable, consistent wavelength transmission that will not deviate with temperature changes, providing reliable imaging results for years to come.

  • What kind of objects is the Optolong L-Para filter best for?

    The Optolong L-Para is specifically designed for imaging emission nebulae, which are rich in Hydrogen-alpha and Oxygen-III light. It excels on targets like the Orion Nebula (M42), the Lagoon Nebula (M8), and the North American Nebula (NGC 7000).

    How does the Optolong L-Para improve images from light-polluted skies?

    It uses a dual narrowband design that selectively passes light from Ha and OIII while blocking broad-spectrum light from artificial sources like mercury, sodium, and LED streetlights. This darkens the sky background and dramatically boosts the contrast of your target.

    Will the Optolong L-Para work with my fast f/2 RASA telescope?

    Yes, the L-Para is engineered for compatibility with a wide range of optical systems, including very fast focal ratios like those found on RASA and HyperStar systems. It's designed to maintain high transmission and avoid band-shifting even with the steep light cones from these instruments.

    Can I use the Optolong L-Para for imaging galaxies like Andromeda (M31)?

    While you can, it's not ideal. The L-Para is a narrowband filter that blocks most of the light from broadband targets like galaxies, which emit light across the entire visible spectrum. For galaxies, a broadband light pollution filter or unfiltered imaging from a dark site is recommended.

    What makes the Optolong L-Para's halo control notable?

    Optolong has specifically optimized the L-Para's coating design to suppress halos, which are the rings of light that can appear around very bright stars. This results in cleaner star fields and prevents nebulosity near bright stars from being obscured.

    Is the Optolong L-Para a good choice for a one-shot-color camera?

    Absolutely. Dual narrowband filters like the L-Para are an excellent match for one-shot-color (OSC) cameras. They allow you to capture both Ha and OIII data simultaneously, simplifying your workflow and producing dramatic, high-contrast nebula images even from urban locations.

  • Optolong 3-Year Warranty