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Optolong L-eNhance Filter - 2"



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


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Optolong L-eNhance Filter - 2"

Optolong's Light Pollution Filter, the L-eNhance Filter - 2-Inch

About L-eNhance Filter

The relentless spread of urbanization and its associated light pollution have become a growing problem for all amateurs and astro photographers. 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. 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 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 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):


L eNhance Filter curve

Optolong will continue to optimize the product according to actual testing, and this curve is not used as the final product data.


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

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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 - 


Accessory TypeContrast Booster & Light Pollution Reduction
BandpassMulti Bandpass
Filter ShapeRound
Filter Size2"
Filter Thickness1.85mm
Filter TypeLPS
Free ShippingYes



Package Details 

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



Customer Reviews

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Nathan D.
United States United States

Great filter for OSC camera

I've had this filter out twice now and it's great for obtaining narrowband with a OSC camera.

Bruce D.
United States United States

L-eNhance filter is a winner

I was delighted with the results in my Bortle 5 skies. I used this filter on my C11" with the hyperstar lens and my ZWO ASI 294MC and 385 MC cameras. The nebulae popped out even after a few stacks. The results are impressive even without doing any post-processing. Bottom line is that this approach is a viable, cost-effective option vs. using a mono cam with expensive multiple NB filters.