Dual-Band Emission Control - The L-Ultimate employs a dual-band approach, harnessing the power of two ultra-narrow 3nm transmission bands. These bands isolate the mesmerizing emissions of nebulae, focusing on H-Alpha (dazzling red) and OIII (captivating green-blue) to amplify your signal while shrouding the sky background in darkness.

Halo-Optimized Performance - We've meticulously optimized the L-Ultimate filter to deliver exceptional halo performance, ensuring your astrophotography reaches new heights.

Perfect for the Urban Explorer -  Crafted especially for astrophotographers navigating urban landscapes plagued by extreme light pollution, the L-Ultimate is your trusted companion for conquering the luminous skies.

IR/UV-Cut Integration - To meet the demands of astrophotography, we've integrated an IR/UV-Cut filter. This essential component safeguards against infrared radiation, catering to cameras sensitive to such wavelengths.

Ultra-Thin, Universal Fit - The ultra-thin filter cell enhances compatibility with most filter wheels, making it a seamless addition to your astrophotography setup.

Anti-Reflective Brilliance - Our multi-layer anti-reflection coating ensures impeccable optical clarity, allowing you to capture the cosmos with unprecedented precision.

Aerospace-Grade Durability - The filter cell, meticulously CNC machined from Aerometal material, boasts a sand-blasted, black anodized finish, and laser engraving for a touch of sophistication.

Secure Storage - The L-Ultimate comes housed in a high-pressure EVA case with a protective plastic PP exterior, safeguarding your investment when not in use.

The benefits of the Optolong L-Ultimate:

- Maximum transmission of nebula emission lines at OIII (500nm) and H-Alpha (656nm).
- Dual transmission bands with a 3nm bandpass.
- Precision-engineered for astrophotography.
- Ideal for urban environments with severe light pollution.
- State-of-the-art IR/UV-Cut filter integration.
- Ultra-thin design for universal filter wheel compatibility.
- Aerospace-grade construction with anti-reflective coating.

Remember, while the L-Ultimate enhances the contrast between nebulae and the night sky, it doesn't eliminate light pollution or boost object brightness.

Advanced Coating Technology - The L-Ultimate is fortified with an interferential coating, applied through electron-beam gun evaporation with Ion-assisted deposition technology. This enhances filter durability, scratch resistance, and stability in central wavelength (CWL), unaffected by temperature fluctuations.

Elevate your astrophotography to new dimensions with the Optolong L-Ultimate, your key to conquering light-polluted skies and revealing the wonders hidden within it.