Optolong L-eNhance Filter

• 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

Specifications:

• 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.