Optolong L-eNhance Filter

SKU: L-eN-1

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  • Regular price $179.00

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The relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astrophotographers. The current solutions to the problem can be expensive and might include the purchase of a monochrome camera, several types of narrowband filters, and a filter wheel.

L-eNhance provides an economical and practical solution for amateurs. It is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and CCD cameras. The convenience and cost effectiveness of this filter allows amateurs to image a rich selection of astronomical images, even in bright, heavily light-polluted areas.

Optolong believes the design of our L-eNhance filter is a technical innovation among filters. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines and achieves a maximum transmission of up to 90%. The performance of this filter delivers images that superbly control the impact from light polluted skies.

L-eNhance Filter Spectrum Curve

According to the characteristics of celestial body emission lines and feature of light pollution span of spectrum, Optolong specially designed and optimized dual-band L-eNhance filter in order to retain the prominent color of nebula RGB while blocking out most of light pollution. 

Which to Choose?

  • L-Pro provides the broadest spectrum and most natural color. Suitable for imaging nebula and galaxy targets.
  • UHC is not as broad spectrum, less natural color, but will block more stray light and skyglow than the L-Pro. Best suited to nebula targets, not broad spectrum targets like galaxies or clusters.
  • L-Enhance is a narrow tri-band filter. Best suited to capturing dim nebula targets. Will decrease brightness of surrounding stars, allowing for more faint detail. 

If you plan to use the filter to image a wide range of targets, the L-Pro is the most versatile. The L-Enhance will provide the most faint detail on emission nebula, and the UHC is a budget option in the middle.

    Substrate: B270
    Thickness: 1.85mm
    Tpeak: T>90%
    Blocking range: 300-1000nm
    Blocking depth: light pollution line blocking >99%
    Surface quality: 60/40
    Transmitted Wavefront RMS: λ/4
    Parallelism (arcsec):


    Coating Parameter

    • Non-cemented optical substrate coating
    • Electron-beam gun evaporation with Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL (central wavelength); no deviation affected by temperature change
    • Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band

    Filter Cell

    • Ultra-thin filter cell minimizes vignetting by maximizing possible clear aperture (clear aperture is 26mm for 1.25”; 45mm for 2”)
    • Aerometal Material
    • Precise CNC Machining
    • Sand Blasting Process
    • Black Anodized Finish
    • Extinction Treatment to Prevent Reflection
    • Laser Engraving No Fading


    • Plastic PP Case
    • Imported High Pressure EVA Case Lining
    • Silver Cardboard Box
    • High Density Sponge Carton Lining


    • Standard 1.25”
    • Standard 2”
    • Canon APS-C Clip Filter

    APS-C Clip filter is tested and compatible with the following camera models: 7D2/80D/800D/77D/70D/760D/750D/700D 650D/600D/550D/500D/400D/100D/1100D 1200D/1300D

    Clip filters are compatible with EF lenses, but not EF-S lenses.