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Optolong L-eNhance Filter - 2"

SKU : OL-13802

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  • 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.
  • Isolates H-alpha, H-beta, and Oxygen iii Nebula Emission Lines
  • The bandwidths are 24nm for OIII and H-beta, and 10nm for Ha
  • Maximum Transmission of up to 90%

Product Details

  • 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 fix for amateurs. It is a dual-band pass filter which has been designed for DSLR (digital SLR), color CMOS and CCD cameras. 

    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 control the impact from light polluted skies.


    L-eNhance Filter Spectrum Curve

    The bandwidths:

    = 24nm for OIII and H-beta

    = 10nm for Ha



    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

    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 light pollution.

  • 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
4.9 Based on 28 Reviews
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Ren M.
Great all around Narrowband duoband filter

This filter has been my work horse and go to filter. I've imaged nebulae with great contrast and clarity in combination with my 2600MC pro and Explore Scientific 127ED scope. The L Extreme supposedly replaces this filter, but there are actually many people out there who have gone back to this filter because the L Extreme requires longer exposure times. This filter is just a great all around to use because of the contrast you get and I've used it even in dark skies (Bortle 3.5). If you have a cooled dedicated astro camera or a modified DSLR, this is the filter to use for capturing emission nebulae.

OPT Telescopes Optolong L-eNhance Filter - 2 ReviewOPT Telescopes Optolong L-eNhance Filter - 2 ReviewOPT Telescopes Optolong L-eNhance Filter - 2 ReviewOPT Telescopes Optolong L-eNhance Filter - 2 ReviewOPT Telescopes Optolong L-eNhance Filter - 2 Review
United States United States

Amazing filter

OPT Telescopes Optolong L-eNhance Filter - 2 Review
Jimmy R.
United States United States
Softer colors

I use the L extreme when the moon is in full force, when the moon is not out this filter gives a softer more natural picture.

A OPT Telescopes Customer
Jim M.
United States United States
Much needed filter in light polluted areas

This filter has helped me reduce the effects of the light pollution in my area. My back yard is a Bortle 8 teetering on a 9. While it hasn't completely erased the effects of light pollution (not sure anything ever could), it does help to drastically reduce the effects of all that light.

Frank B.
United States United States

I have several lower cost 2” filters that are OK, but not in this caliber. The Optolong L-eNhance Filter is fantastic and makes a big difference in imaging. I live in a Bortel 4 area, which is not bad, but this filter is outstanding and does what it is supposed to do. I use an iOptron CEM40EC mount and first test with this filter was with an Astro-Tech AT72EDII Refractor and Nikon D750. Since I was only testing and not being serious I was shooting 25 second exposures at ISO6400. Results were hard to believe. Has been cloudy here in Florida for over a week now and forecast another week or so before it clears up. I am certain this filter will be a winner when I can shoot a load of subs and do some stacking. Too bad I could not upload a photo done with only the 25 sec exposure.

OPT Telescopes Optolong L-eNhance Filter - 2 Review
Dylan S.
United States United States
So far so good

I recently bought the L-enhance filter. I have used it only once but so far I am very pleased with the results! The first light was on the Western Veil Nebula. I got a striking photo! Would recommend!

OPT Telescopes Optolong L-eNhance Filter - 2 ReviewOPT Telescopes Optolong L-eNhance Filter - 2 Review