Optolong L-eNhance Filter - 1.25"

Brand: Optolong

SKU : OL-13801

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  • Optolong's Light Pollution Suppression Filter
  • The bandwidths are 24nm for OIII and H-beta, 10nm for H-a
  • Isolates H-alpha, H-beta, and Oxygen iii Nebula Emission Lines
  • Maximum Transmission of up to 90%


Product Details

  • Optolong's Light Pollution Suppression Filter, the L-eNhance Filter - 1.25-Inch

    About L-eNhance Filter

    The relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astrophotographers. The current fixes 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 suppression filter 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 their 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-percent. The performance of this filter delivers images that superbly control the impact from light polluted skies.

    L-eNhance Filter Spectrum Curve

    The bandwidths:

    =24nm for OIII and H-beta

    =10nm for Ha


    Optolong specially designed and optimized their dual-band L-eNhance filter according to the characteristics of celestial body emission lines and features of the light pollution spectrum span. This retains the prominent color of nebula RGB while blocking out most of the light pollution. 

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


    Compare the L-eNhance, L-eXtreme, and L-Pro filters:

    Optolong L-eNhance Filter - 1-25-transmission-01

    Optolong L-eNhance Filter - 1-25-transmission-02

    Optolong L-eNhance Filter - 1-25-transmission-03

    You can also view these charts in greater detail in the Gallery tab by clicking on the individual thumbnail images there.

    Manufacturer's Notes:

    The colors in these images may vary slightly to the final product due to continued development and the display colors for monitors.

    Coating: This Interference filter may change surface color depending upon light and movement. 

    Product: All of these specifications may change in order to  improve product quality. They ask your understanding if any updated information is delayed on publishing.

    Product Series: Please note that this series of filters will have the same specifications, processing techniques, and test methods. They will only have size differences. - Shown is a 2-inch filter - 

  • specifications

    BandpassMulti Bandpass
    Filter ShapeRound
    Filter Thickness1.85mm
    Filter TypeLight Pollution/City Light Suppression
    Free ShippingYes
  • included items


    Package Details 

    • Silver cardboard box
    • Plastic PP box
    • Imported high pressure EVA case lining



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