Skip to product information
1 of 2


Optolong L-eNhance Filter

Optolong L-eNhance Filter

Regular price $12,999.00 USD
Regular price Sale price $12,999.00 USD
Sale Sold out
Warning: As a critical safety reminder, the Optolong L-eNhance filter is not intended for solar observation. It should NEVER be used to observe the sun directly, as it can result in irreversible blindness.  EDISLA does not assume responsibility for any incidents that may occur due to improper usage.
  • 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%

Introducing the Optolong L-eNhance Filter:

The Optolong L-eNhance Filter is a dual-band pass filter meticulously designed for use with DSLR (digital SLR), color CMOS, and monochrome CCD cameras. This filter offers a cost-effective and practical solution for amateur astrophotographers, allowing them to capture a diverse range of astronomical images, even in areas plagued by substantial light pollution. It effectively isolates the H-Alpha, H-Beta, and Oxygen III nebula emission lines, achieving a remarkable maximum transmission of up to 90%. The filter's performance empowers photographers to produce images that significantly mitigate the impact of light pollution.

L-eNhance Introduction: The rapid urbanization and consequent light pollution have presented a growing challenge for amateur astrophotographers. Existing solutions to this problem can be costly, often requiring the purchase of monochrome cameras, various narrowband filters, and filter wheels.

The Optolong L-eNhance Filter offers an economical and pragmatic alternative for amateurs. It is a dual-band pass filter tailored for DSLRs, color CMOS, and monochrome CCD cameras. Its convenience and affordability enable amateur astronomers to capture a wide range of astronomical images, even in well-lit and heavily light-polluted urban areas. Optolong considers the design of the L-eNhance filter to be a technical innovation in the realm of filters. It effectively isolates key nebula emission lines, including H-Alpha, H-Beta, and Oxygen III, with a maximum transmission rate of 90%. The filter's performance results in images that effectively counteract the challenges posed by light-polluted skies.

Spectrum and Characteristics:

  • Substrate: B270
  • Thickness: 1.85mm
  • Peak Transmission (Tpeak): T>90%
  • Blocking Range: 300-1000nm
  • Blocking Depth: Light pollution line blocking >99%
  • Surface Quality: 60/40
  • Transmitted Wavefront RMS: λ/4
  • Parallelism: 30 seconds


  • Optolong L-eNhance is available in various configurations:
    • 1.25" (1 1/4" mounted) and 2" mounted for eyepiece use.
    • SLR Camera clip filters compatible with EOS-C cameras.

Coating Technology: The Optolong L-eNhance Filter utilizes advanced coating technologies to ensure durability and optical performance. These include multi-layer anti-reflection coating and non-cementing optical substrate coating. Precision coating based on Ion-assisted deposition coating technology is employed to resist scratching and maintain stability regarding the central wavelength (CWL) even under temperature variations. A planetary rotation system during the coating process guarantees precision and uniformity of coatings, resulting in high transmission in the pass-band and optimal optical density in the off-band.

Packaging: The filter is thoughtfully packaged for protection:

  • Outer Box: Silver box
  • Plastic Box: Made of PP material
  • Lining: Features imported high-pressure white EVA material.

In summary, the Optolong L-eNhance Filter offers an essential tool for amateur astrophotographers, enabling them to capture stunning images in light-polluted environments. Safety warnings must be strictly followed, particularly concerning solar observations, to prevent potential eye damage.

Interpreting the Chart: The provided chart offers insights into the filter's performance characteristics:

  • The horizontal axis represents the wavelength in nanometers (nm).
  • The vertical axis illustrates transmission percentages (%).
  • The WHITE line represents the filter's transmission, while artificial lines are depicted in YELLOW. The H-Beta line is shown in BLUE, the OIII line is in GREEN, and the H-Alpha line is displayed in RED.

View full details