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

£145.00✓ 2 year warranty


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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

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