About this product
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
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)
- 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
- 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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