{"title":"Leviathan Optical","description":"\u003cp style=\"text-align: center;\"\u003eHorizon Astronomy is an Authorised LEVIATHAN OPTICAL Retailer for Europe. If you are looking for a specific Leviathan Optical product not listed below please \u003ca href=\"https:\/\/www.horizonastronomy.ie\/pages\/contact-us\" rel=\"noopener\" target=\"_blank\"\u003econtact us here\u003c\/a\u003e\u003ca href=\"https:\/\/www.horizonastronomy.ie\/en-de\/pages\/contact-us\" rel=\"noopener\" target=\"_blank\"\u003e\u003c\/a\u003e - and we would be happy to help you.\u003c\/p\u003e","products":[{"product_id":"leviathan-spectral-pro-light-pollution-filter-2","title":"Leviathan Spectral PRO Light Pollution Filter - 2\"","description":"\u003cp\u003e\u003cstrong\u003eDesigned \u0026amp; 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.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eLight 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.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eSo what makes the Leviathan Pro filter so different:  \u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSelective Bandpass:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003e*\u003c\/strong\u003e\u003c\/span\u003e 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOptimized for Fast f\/2 Systems:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFast 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 -\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMaintains \u0026gt;95% transmission at f\/2.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMinimizes band shift and edge roll-off\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDelivers consistent spectral response across the entire image circle\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThis ensures wide-field, fast-ratio imaging systems perform at their full potential without introducing artifacts or contrast loss.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHalo-Free Imaging by Design:\u003cbr\u003e\u003c\/strong\u003e\u003cbr\u003eMany 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 -\u003c\/p\u003e\n\u003cp\u003eA precision coating design and manufacturing to suppress internal reflections\u003cbr\u003eOptical-grade polishing and flatness to minimize back-reflection paths\u003cbr\u003eCareful substrate selection and coating stack design to avoid ghosting\u003cbr\u003eThe result: Clear, clean star profiles—even around the brightest stars in the sky.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOne Filter to Rule Them All:\u003cbr\u003e\u003c\/strong\u003e\u003cbr\u003eThis 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 -\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFilter wheels\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMonochrome sensors\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eComplex stacking and masking\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMinimized gradients and simplified post processing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWhether you're imaging nebulae, galaxies, or Milky Way panoramas, the Spectral\u003c\/li\u003e\n\u003cli\u003ePro delivers a consistent, high-contrast result from city suburbs to dark sites.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eZero-Compromise Optical Design:\u003c\/strong\u003e\u003cbr\u003eMany 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 -\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSimulated in full optical design software\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTested across a wide range of systems\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOptimized to reduce mechanical and optical vignetting\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eIf any vignetting remains, it’s likely due to non-uniform illumination inherent in your optical train—not from the filter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eVersatile in Advanced Setups:\u003c\/strong\u003e\u003cbr\u003eThanks 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.\u003cbr\u003e\u003cbr\u003eView the \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0596\/1924\/6275\/files\/Leviathan_Spectral_Pro_Datasheet.pdf?v=1771357944\" rel=\"noopener\" target=\"_blank\"\u003eSpectral PRO Datasheet Here\u003c\/a\u003e\u0026gt;\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Dimensions:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(unmounted version) 47mm\u003c\/li\u003e\n\u003cli\u003eFilter thickness: 2mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eWhats included:\u003c\/em\u003e\u003cbr\u003e\u003cem\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\u003cem\u003e1 x Spectral Pro Filter 2\"\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Leviathan Optical","offers":[{"title":"2\" Mounted","offer_id":57055869665615,"sku":"SPECTRA2-M","price":879.0,"currency_code":"EUR","in_stock":true},{"title":"2\" Unmounted","offer_id":57055869698383,"sku":"SPECTRA2-UN","price":789.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/1924\/6275\/files\/Leviathan_Spectral_PRO_Filter_1.jpg?v=1771355198"},{"product_id":"leviathan-spectral-pro-light-pollution-filter-1-25-copy","title":"Leviathan Spectral PRO Light Pollution Filter - 1.25\"","description":"\u003cp\u003e\u003cstrong\u003eDesigned \u0026amp; 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.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eLight 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.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eSo what makes the Leviathan Pro filter so different:  \u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSelective Bandpass:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cstrong\u003e*\u003c\/strong\u003e\u003c\/span\u003e 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOptimized for Fast f\/2 Systems:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFast 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 -\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMaintains \u0026gt;95% transmission at f\/2.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMinimizes band shift and edge roll-off\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDelivers consistent spectral response across the entire image circle\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eThis ensures wide-field, fast-ratio imaging systems perform at their full potential without introducing artifacts or contrast loss.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHalo-Free Imaging by Design:\u003cbr\u003e\u003c\/strong\u003e\u003cbr\u003eMany 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 -\u003c\/p\u003e\n\u003cp\u003eA precision coating design and manufacturing to suppress internal reflections\u003cbr\u003eOptical-grade polishing and flatness to minimize back-reflection paths\u003cbr\u003eCareful substrate selection and coating stack design to avoid ghosting\u003cbr\u003eThe result: Clear, clean star profiles—even around the brightest stars in the sky.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eOne Filter to Rule Them All:\u003cbr\u003e\u003c\/strong\u003e\u003cbr\u003eThis 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 -\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFilter wheels\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMonochrome sensors\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eComplex stacking and masking\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMinimized gradients and simplified post processing\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWhether you're imaging nebulae, galaxies, or Milky Way panoramas, the Spectral\u003c\/li\u003e\n\u003cli\u003ePro delivers a consistent, high-contrast result from city suburbs to dark sites.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eZero-Compromise Optical Design:\u003c\/strong\u003e\u003cbr\u003eMany 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 -\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSimulated in full optical design software\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTested across a wide range of systems\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOptimized to reduce mechanical and optical vignetting\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eIf any vignetting remains, it’s likely due to non-uniform illumination inherent in your optical train—not from the filter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eVersatile in Advanced Setups:\u003c\/strong\u003e\u003cbr\u003eThanks 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.\u003c\/p\u003e\n\u003cp\u003eView the \u003ca rel=\"noopener\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0596\/1924\/6275\/files\/Leviathan_Spectral_Pro_Datasheet.pdf?v=1771357944\" target=\"_blank\"\u003eSpectral PRO Datasheet Here\u003c\/a\u003e\u0026gt; \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFilter Dimensions:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e(unmounted version) 27.7mm\u003c\/li\u003e\n\u003cli\u003eFilter thickness: 2mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eWhats included:\u003c\/em\u003e\u003cbr\u003e\u003cem\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003e\u003cem\u003e1 x Spectral Pro Filter 1.25\"\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ol\u003e","brand":"Leviathan Optical","offers":[{"title":"1.25\" Mounted","offer_id":57056018268495,"sku":"SPECTRA125-M","price":415.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/1924\/6275\/files\/Leviathan_Spectral_PRO_Filter_1.jpg?v=1771355198"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/1924\/6275\/collections\/Brand_Header_088b04e9-2e32-4724-bfd2-5938430f3b41.jpg?v=1779097052","url":"https:\/\/www.horizonastronomy.ie\/en-nl\/collections\/leviathan-optical.oembed","provider":"Horizon Astronomy • Telescope Center","version":"1.0","type":"link"}