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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 L-Quad Enhance Filter

Optolong L-Quad Enhance Filter

by Optolong
SKU OPT-14702
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$199.00 USD
$199.00 USD - $199.00 USD
$199.00 USD
$189.00 USD
$189.00 USD - $189.00 USD
$189.00 USD
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  • Versatile light pollution suppression
  • Quad-bandpass design
  • Isolates key emission lines for nebulae and galaxies
  • Provides higher contrast and better color balance
  • Reduces star halos and bloat
Availability:
2 in stock

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More information

  • Description
  • Specifications
  • In the Box

  • Optolong L-Quad Enhance Filter Overview

    The Optolong L-Quad Enhance Filter (L-QEF) is a high-performance quad-bandpass filter engineered for astrophotographers using color cameras. It is designed to suppress light pollution from sources like mercury and sodium lamps while allowing key emission lines from celestial objects to pass through. This filter effectively enhances the contrast and details of deep-sky targets, including nebulae, galaxies, and star clusters, making it an excellent tool for astrophotography from light-polluted urban and suburban areas.

    Versatile Quad-Bandpass Performance

    Unlike many narrowband filters, the L-Quad Enhance captures signals from four key emission lines in a single exposure when paired with a color camera: H-beta, OIII, H-alpha, and SII. This maximizes the signal from a wide variety of targets, including both emission and reflection nebulae, as well as star clusters and galaxies. This broad coverage makes it an ideal all-around filter for photographers seeking to save time and simplify their setup while achieving stunning results.

    Optolong L-Pro comparison

    L-Quad Enhance vs. L-Pro

    The L-Quad Enhance represents an evolution of its popular predecessor, the L-Pro. While the L-Pro is an excellent light pollution filter, the L-QEF offers key improvements for superior performance:

    • Better Color Balance – The L-QEF provides more naturally balanced color channels, reducing the strong green cast often seen with the L-Pro.
    • Higher Contrast – It offers a visibly higher contrast and a more even background, making faint details stand out more clearly.
    • Improved Star Performance – The L-QEF is better at handling bright stars, effectively suppressing halos and starbursts for a cleaner final image.
    • Superior Infrared Blocking – The L-QEF filters infrared light more correctly, leading to less noise and a cleaner image.
    Optolong L-Pro transmission graph

    UV and IR Blocking

    The L-Quad Enhance filter's design includes a near-infrared (IR) cut-off up to 1000nm. This feature reduces IR noise and helps ensure that extraneous light from both ends of the visible spectrum does not interfere with the final image, simplifying your imaging workflow.

    L-Pro filter installed on eyepiece

  • Material

    Schott optical glass

    Thickness

    1.85mm

    Filter Cell Height

    4.8mm without male thread, 6.8mm with thread

    Surface Quality

    60/40 (Refer to MIL-O-13830)

    Optical Polish

    Fine-optically polished to ensure accurate 1/4 wavefront and < 30 seconds parallelism

    Transmission

    High transmission at H-beta, OIII, H-alpha and SII emission lines

    Blocking

    OD2-OD4 (300-1000nm), blocking all major artificial light pollution lines
    • L-Pro Filter

      L-Quad Enhance filter

      × 1

    • Plastic Filter Case

      Plastic Filter Case

      × 1