Leviathan Spectral Pro 2" Light Pollution Filter

Leviathan Spectral Pro 2" Light Pollution Filter

The LEVIATHAN Spectral Pro is a next-generation light pollution suppression filter, designed using real-world spectral data from cities across the globe. It selectively blocks actual skyglow sources while preserving the critical emission bands used in deep-sky imaging.

• Blocks dominant LED, metal halide, and sodium light pollution bands
• Passes optimal emission lines, galactic spectra including dust, and reflection nebula spectra
• Optimized through rigorous laboratory testing and real-sky validation
• Get all the details on the Datasheet
• See the growing user gallery here.

Optimised for fast F2 Systems 

Fast optical systems (like Hyperstar, Rokinon/Samyang, or f/2 astrographs) often suffer from reduced filter performance due to steep angles of incidence. The Spectral Pro is specifically engineered for these conditions:

• Maintains >95% transmission at f/2
• Minimizes band shift and edge roll-off
• Delivers consistent spectral response across the entire image circle

This ensures wide-field, fast-ratio imaging systems perform at their full potential—without introducing artifacts or contrast loss.

Halo Free Imaging, By Design

Many filters suffer from internal reflections and bright star halos, especially around emission-line targets like Sirius or Vega. The Spectral Pro eliminates these issues through:

• Precision coating design and manufacturing to suppress internal reflections
• Optical-grade polishing and flatness to minimize back-reflection paths
• Careful substrate selection and coating stack design to avoid ghosting

The result: Clear, clean star profiles—even around the brightest stars in the sky.

Performance Highlights:

• >98% transmission on-axis
• >95% at f/2 across critical bands
• Advanced multiband coating with precise spectral targeting
• High-efficiency broadband coating on both surfaces
• Flat response across the field for full-frame sensors

Hybrid Design

This is not a typical broadband or narrowband filter. The Spectral Pro is a hybrid spectral design that works across a wide range of targets and environments. No need for:

• Filter wheels
• Monochrome sensors
• Complex stacking and masking
• Minimized gradients and simplified post processing

Whether you're imaging nebulae, galaxies, or Milky Way panoramas, the Spectral Pro delivers a consistent, high-contrast result from city suburbs to dark sites.

Zero Compromise Optical Design

Most filters on the market induce corner vignetting—especially on full-frame sensors—because they use undersized glass or poorly designed mounts. The Spectral Pro is:

• Simulated in full optical design software
• Tested across a wide range of systems
• Optimized to reduce mechanical and optical vignetting

If any vignetting remains, it’s likely due to non-uniform illumination inherent in your optical train—not from the filter.

Versatile, for Advanced Setups

Thanks to its spectral neutrality and optical precision, the Spectral Pro also functions as a luminance filter in monochrome or narrowband setups. Should you change your setup in the future or decide to combine OSC broadband data with narrowband data, the Spectral Pro will always remain useful.