Leviathan Spectral PRO Light Pollution Filter - 1.25"

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

Light Pollution is becoming an increasing problem for Astronomers and Astrophotographers around the world and a premium quality light pollution filter is without a doubt becoming an absolute essential tool in your Astronomy kit, particularly if you are also an Astrophotographer living in a high Bortle scale region.

So what makes the Leviathan Pro filter so different:  

Selective Bandpass:

The Spectral PRO very successfully blocks dominant LED, metal halide, and sodium light pollution bands and selectively allows just optimal emission lines, galactic spectra including dust, and reflection nebula spectra through the filter. This filter has been thoroughly optimized through rigorous laboratory testing and even real-sky validation tests.

* In fact just take a look at some of the real sky examples in the photo gallery to see just how effective this light pollution filter can be.

Optimized for Fast f/2 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 to address 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 as a result bright star halos, especially around emission-line targets like Sirius or Vega. The Spectral Pro eliminates these issues through -

A 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.

One Filter to Rule Them All:

This is not just 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:
Many filters on the market induce corner vignetting, especially on full-frame sensors because they use undersized glass or poorly designed filter 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 in 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 an important part of your Astrophotography setup.

View the Spectral PRO Datasheet Here> 

Whats included:

1. 1 x Spectral Pro Filter 1.25"