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Optolong L-eNhance Filter - 1.25"

SKU : OL-13801

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  • Optolong's Light Pollution Suppression Filter
  • The bandwidths are 24 nm for OIII and H-beta, 10 nm 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:

    =24 nm for OIII and H-beta

    =10 nm 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: 1.85 mm
    Tpeak: T>90%
    Blocking range: 300 to 1000 nm
    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.


    Sample photos

    VSR300 11

    Imaging Target: Vela Supernova Remnant
    Camera : CentralDS Astro A7s (cooled at -2C)
    Lens : Canon EF 300 mm f/4L (non-IS)
    Filter : Optolong L-eNhance
    ISO : 6400
    Tracker : Star Adventurer
    Autoguide : none
    Exp time : 1-min X 81-frames
    w Dark, Bias frames
    process with PI, PS CC
    Offered by Optolong co-photographer Vincent Cheng

    55551870 10156095653139249 5134288593803542528 o

    After a simple red structure transformation, the effect of SHO Hubble color can also be simulated. Compared with the previous narrow band filters of Ha, SII, and OIII, the L-eNhance filter is a good substitution. This so-called "one filter" is multi-purpose,it's worth to have.

    Tommy Lim

    Imaging Target:NGC 3372 Eta Carinae
    Camera: QHY168C
    Telescope: Pentax 100 SDUF II F/4
    Filter:Optolong L-eNhance
    Light Frames 15 x 240sec
    Dark Frames 15 x 240sec
    Bias Frames 50 x 0.001sec
    Flat Frames 15 x 0.55sec
    Software: SIRIL & Pixinsight 1.8.6
    Offered by Optolong co-photographer Tommy Lim




    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



Product Reviews

Customer Reviews
5.0 Based on 3 Reviews
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Filter Reviews:
Cody W.
United States United States
Best purchase so far

I live in a B7 southeast Michigan area. Right alongside Sarnia, Ontarios “chemical valley”. Its miles upon miles of factories and industry, and it completely drowns out my eastern skies. I could never see Horsehead with 1.5-2.0 min exposures before, and now im getting sub 50.0 sec exposures. Highly recommend for anybody battling LP.

OPT Telescopes Optolong L-eNhance Filter - 1.25 Review
United States United States
Excellent results

I used this filter on a 120mm achromatic refractor photographing the Pinwheel Galaxy. What a huge difference. The blue halo's around the stars disappeared. Cut down processing time.

Tim S.
United States United States
Optolong L eNhance Filter

Simply the best filter for my OSC camera. Preforms very well in my bortle 8 skies. Highly recommended.