Optolong L-eNhance Dual Narrowband Deep Sky Imaging Filter
 Optolong L-eNhance Dual Narrowband Deep Sky Imaging FilterOptolong L-eNhance Dual Narrowband Deep Sky Imaging Filter 

Optolong L-eNhance Dual Narrowband Deep Sky Imaging Filter

  (1 Review)
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About this product

Model:  opt_l-enhance_1.25

Dual Narrowband Filter for One Shot Colour / DSLR Imaging - Simultaneously Capture H-alpha, H-beta and Oxygen III

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


  • High transmission of H-Alpha, H-Beta and Oxygen III emission lines (avg. 90% or higher)
  • Use with colour DSLR, CMOS and CCD Cameras
  • 1.25" or 2" Mounted Sizes
  • Supplied in a protective plastic case with EVA foam lining
  • More than 150 coating layers on B270 glass.
  • 1.85mm Thick Glass
  • Fine-optically polished on both sides - ensures accurate λ/4 wavefront and <30 seconds parallelism over the both surfaces
  • Ultrasonic wave cleaned substrate with purified water - Cleanup by 13 stage purified water tank to remove impurities and dust effectively
  • Ion source assisted coating— For durability and resistance to scratching, as well as stability on CWL (central wavelength)  - no deviation affected by temperature change
  • Stringent quality testing process - each filter is tested on a spectrophotometer and laser interferometer

Transmission Chart

White Line - Represents the transmission curve of the L-eNhance Filter.

The Major Emission Lines of Nebulae: H-α (656.3nm), H-β (486.1nm), OIII (495.9nm) and OIII (500.7nm)

The Major Emission Lines of Artificial Light Pollution: Hg / Mercury (435.8nm, 546.1nm, 577nm and 578.1nm), Na / Sodium (598nm, 589.6nm, 615.4nm and 616.1nm)

Sample Images

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

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

  • Imaging Target:NGC 3372 Eta Carinae
  • Camera: QHY168C
  • Telescope: Pentax 100 SDUF II F/4
  • Filter:Optolong L-eNhance
  • Exposure:
    • 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

What's in the box

  • L-eNhance Filter
  • Silver Cardboard Box
  • Plastic PP Box
  • High Pressure EVA case lining


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): 30s

Customer reviews

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Optolong L-eNhance
Thursday, 24 October 2019  | 

Still early days, but Iíve used this a few nights with my Canon 100D (Astro) on a RedCat51, and it certainly darkens the background to improve the SNR. Still getting used to the whole combo, but it should let me image emission nebula even when the moon is quite full.


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