{"title":"Leviathan Optical Filters","description":"\u003cp class=\"font_8 wixui-rich-text__text\"\u003eLeviathan Optical Engineering is an Irish-based optical filter manufacturer.\u003c\/p\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003eTheir work spans bespoke optical system development, stray light analysis, and high-performance accessories for astrophotography.\u003c\/p\u003e\n\u003cp class=\"font_8 wixui-rich-text__text\"\u003eFounded by Dr. James Murphy, a specialist in lens and prism system design, Leviathan Optical Engineering draws inspiration from the 19th-century Leviathan of Parsonstown telescope—a symbol of ambition and technical excellence. Today, they carry forward that legacy by delivering optics that are not only precisely engineered, but purpose-built for real-world performance.\u003c\/p\u003e","products":[{"product_id":"leviathan-spectral-pro-1-25-light-pollution-filter","title":"Leviathan Spectral Pro 1.25\" Light Pollution Filter","description":"\u003cdiv class=\"lefttext\"\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 12px;\"\u003e\u003cspan style=\"font-family: verdana,geneva,sans-serif;\"\u003e\u003cstrong\u003eLeviathan Spectral Pro 1.25\" Light Pollution Filter\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp data-start=\"1179\" data-end=\"1450\"\u003eThe 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.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"1454\" data-end=\"1511\"\u003eBlocks dominant LED, metal halide, and sodium light pollution bands\u003c\/li\u003e\n\u003cli data-start=\"1514\" data-end=\"1572\"\u003ePasses optimal emission lines, galactic spectra including dust, and reflection nebula spectra\u003c\/li\u003e\n\u003cli data-start=\"1575\" data-end=\"1649\"\u003eOptimized through rigorous laboratory testing and real-sky validation\u003c\/li\u003e\n\u003cli data-start=\"1575\" data-end=\"1649\"\u003eGet all the details on the\u003cstrong\u003e \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0908\/7254\/5546\/files\/Leviathan_Spectral_Pro_Datasheet_080825c.pdf?v=1754682793\" title=\"Spectral Pro Datasheet Field Testing Laboratory Results\" rel=\"noopener\" target=\"_blank\"\u003eDatasheet\u003c\/a\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1575\" data-end=\"1649\"\u003eSee the growing user gallery \u003ca rel=\"noopener\" title=\"Leviathan user gallery\" href=\"https:\/\/shop.leviathanoptical.com\/pages\/leviathan-filter-gallery\" target=\"_blank\"\u003ehere\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"text-decoration: underline;\"\u003eOptimised for fast F2 Systems \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1748\" data-end=\"1969\"\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 for these conditions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"1973\" data-end=\"2011\"\u003eMaintains \u0026gt;95% transmission at f\/2\u003c\/li\u003e\n\u003cli data-start=\"2014\" data-end=\"2056\"\u003eMinimizes band shift and edge roll-off\u003c\/li\u003e\n\u003cli data-start=\"2059\" data-end=\"2131\"\u003eDelivers consistent spectral response across the entire image circle\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2133\" data-end=\"2266\"\u003eThis ensures wide-field, fast-ratio imaging systems perform at their full potential—without introducing artifacts or contrast loss.\u003c\/p\u003e\n\u003cp data-start=\"2133\" data-end=\"2266\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"2133\" data-end=\"2266\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eHalo Free Imaging, By Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"2310\" data-end=\"2491\"\u003eMany 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:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"2495\" data-end=\"2563\"\u003ePrecision coating design and manufacturing to suppress internal reflections\u003c\/li\u003e\n\u003cli data-start=\"2566\" data-end=\"2641\"\u003eOptical-grade polishing and flatness to minimize back-reflection paths\u003c\/li\u003e\n\u003cli data-start=\"2644\" data-end=\"2719\"\u003eCareful substrate selection and coating stack design to avoid ghosting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2721\" data-end=\"2809\"\u003e\u003cstrong data-start=\"2721\" data-end=\"2736\"\u003eThe result:\u003c\/strong\u003e Clear, clean star profiles—even around the brightest stars in the sky.\u003c\/p\u003e\n\u003cp data-start=\"2721\" data-end=\"2809\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"2721\" data-end=\"2809\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003ePerformance Highlights:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"2850\" data-end=\"2879\"\u003e\u0026gt;98% transmission on-axis\u003c\/li\u003e\n\u003cli data-start=\"2882\" data-end=\"2919\"\u003e\u0026gt;95% at f\/2 across critical bands\u003c\/li\u003e\n\u003cli data-start=\"2922\" data-end=\"2984\"\u003eAdvanced multiband coating with precise spectral targeting\u003c\/li\u003e\n\u003cli data-start=\"2987\" data-end=\"3044\"\u003eHigh-efficiency broadband coating on both surfaces\u003c\/li\u003e\n\u003cli data-start=\"3047\" data-end=\"3104\"\u003eFlat response across the field for full-frame sensors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eHybrid Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"3148\" data-end=\"3325\"\u003eThis is not a typical broadband or narrowband filter. The Spectral Pro is a \u003cstrong data-start=\"3224\" data-end=\"3250\"\u003ehybrid spectral design\u003c\/strong\u003e that works across a wide range of targets and environments. No need for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"3329\" data-end=\"3344\"\u003eFilter wheels\u003c\/li\u003e\n\u003cli data-start=\"3347\" data-end=\"3367\"\u003eMonochrome sensors\u003c\/li\u003e\n\u003cli data-start=\"3370\" data-end=\"3400\"\u003eComplex stacking and masking\u003c\/li\u003e\n\u003cli data-start=\"3370\" data-end=\"3400\"\u003eMinimized gradients and simplified post processing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3402\" data-end=\"3563\"\u003eWhether you're imaging nebulae, galaxies, or Milky Way panoramas, the Spectral Pro delivers a consistent, high-contrast result from city suburbs to dark sites.\u003c\/p\u003e\n\u003cp data-start=\"3402\" data-end=\"3563\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"3402\" data-end=\"3563\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eZero Compromise Optical Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"3610\" data-end=\"3778\"\u003eMost 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:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-start=\"3782\" data-end=\"3828\"\u003eSimulated in full optical design software\u003c\/li\u003e\n\u003cli data-start=\"3831\" data-end=\"3873\"\u003eTested across a wide range of systems\u003c\/li\u003e\n\u003cli data-start=\"3876\" data-end=\"3935\"\u003eOptimized to reduce mechanical and optical vignetting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3937\" data-end=\"4061\"\u003eIf any vignetting remains, it’s likely due to non-uniform illumination inherent in your optical train—not from the filter.\u003c\/p\u003e\n\u003cp data-start=\"3937\" data-end=\"4061\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"3937\" data-end=\"4061\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eVersatile, for Advanced Setups\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"3937\" data-end=\"4061\"\u003eThanks to its spectral neutrality and optical precision, the Spectral Pro also functions as a \u003cstrong data-start=\"4200\" data-end=\"4220\"\u003eluminance filter\u003c\/strong\u003e 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.\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cspan\u003e\u003c\/span\u003e\n\u003c\/div\u003e","brand":"Leviathan","offers":[{"title":"Default Title","offer_id":57942433890649,"sku":"LEV-SPro-125","price":409.95,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0249\/6213\/8192\/files\/Spectral_pro.jpg?v=1777369963"},{"product_id":"leviathan-spectral-pro-2-light-pollution-filter","title":"Leviathan Spectral Pro 2\" Light Pollution Filter","description":"\u003cdiv class=\"lefttext\"\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 12px;\"\u003e\u003cspan style=\"font-family: verdana,geneva,sans-serif;\"\u003e\u003cstrong\u003eLeviathan Spectral Pro 2\" Light Pollution Filter\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp data-end=\"1450\" data-start=\"1179\"\u003eThe 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.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"1511\" data-start=\"1454\"\u003eBlocks dominant LED, metal halide, and sodium light pollution bands\u003c\/li\u003e\n\u003cli data-end=\"1572\" data-start=\"1514\"\u003ePasses optimal emission lines, galactic spectra including dust, and reflection nebula spectra\u003c\/li\u003e\n\u003cli data-end=\"1649\" data-start=\"1575\"\u003eOptimized through rigorous laboratory testing and real-sky validation\u003c\/li\u003e\n\u003cli data-end=\"1649\" data-start=\"1575\"\u003eGet all the details on the\u003cstrong\u003e \u003ca rel=\"noopener\" title=\"Spectral Pro Datasheet Field Testing Laboratory Results\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0908\/7254\/5546\/files\/Leviathan_Spectral_Pro_Datasheet_080825c.pdf?v=1754682793\" target=\"_blank\"\u003eDatasheet\u003c\/a\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1649\" data-start=\"1575\"\u003eSee the growing user gallery \u003ca href=\"https:\/\/shop.leviathanoptical.com\/pages\/leviathan-filter-gallery\" title=\"Leviathan user gallery\" rel=\"noopener\" target=\"_blank\"\u003ehere\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"text-decoration: underline;\"\u003eOptimised for fast F2 Systems \u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"1969\" data-start=\"1748\"\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 for these conditions:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"2011\" data-start=\"1973\"\u003eMaintains \u0026gt;95% transmission at f\/2\u003c\/li\u003e\n\u003cli data-end=\"2056\" data-start=\"2014\"\u003eMinimizes band shift and edge roll-off\u003c\/li\u003e\n\u003cli data-end=\"2131\" data-start=\"2059\"\u003eDelivers consistent spectral response across the entire image circle\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2266\" data-start=\"2133\"\u003eThis ensures wide-field, fast-ratio imaging systems perform at their full potential—without introducing artifacts or contrast loss.\u003c\/p\u003e\n\u003cp data-end=\"2266\" data-start=\"2133\"\u003e \u003c\/p\u003e\n\u003cp data-end=\"2266\" data-start=\"2133\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eHalo Free Imaging, By Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"2491\" data-start=\"2310\"\u003eMany 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:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"2563\" data-start=\"2495\"\u003ePrecision coating design and manufacturing to suppress internal reflections\u003c\/li\u003e\n\u003cli data-end=\"2641\" data-start=\"2566\"\u003eOptical-grade polishing and flatness to minimize back-reflection paths\u003c\/li\u003e\n\u003cli data-end=\"2719\" data-start=\"2644\"\u003eCareful substrate selection and coating stack design to avoid ghosting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2809\" data-start=\"2721\"\u003e\u003cstrong data-end=\"2736\" data-start=\"2721\"\u003eThe result:\u003c\/strong\u003e Clear, clean star profiles—even around the brightest stars in the sky.\u003c\/p\u003e\n\u003cp data-end=\"2809\" data-start=\"2721\"\u003e \u003c\/p\u003e\n\u003cp data-end=\"2809\" data-start=\"2721\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003ePerformance Highlights:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"2879\" data-start=\"2850\"\u003e\u0026gt;98% transmission on-axis\u003c\/li\u003e\n\u003cli data-end=\"2919\" data-start=\"2882\"\u003e\u0026gt;95% at f\/2 across critical bands\u003c\/li\u003e\n\u003cli data-end=\"2984\" data-start=\"2922\"\u003eAdvanced multiband coating with precise spectral targeting\u003c\/li\u003e\n\u003cli data-end=\"3044\" data-start=\"2987\"\u003eHigh-efficiency broadband coating on both surfaces\u003c\/li\u003e\n\u003cli data-end=\"3104\" data-start=\"3047\"\u003eFlat response across the field for full-frame sensors\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eHybrid Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"3325\" data-start=\"3148\"\u003eThis is not a typical broadband or narrowband filter. The Spectral Pro is a \u003cstrong data-end=\"3250\" data-start=\"3224\"\u003ehybrid spectral design\u003c\/strong\u003e that works across a wide range of targets and environments. No need for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"3344\" data-start=\"3329\"\u003eFilter wheels\u003c\/li\u003e\n\u003cli data-end=\"3367\" data-start=\"3347\"\u003eMonochrome sensors\u003c\/li\u003e\n\u003cli data-end=\"3400\" data-start=\"3370\"\u003eComplex stacking and masking\u003c\/li\u003e\n\u003cli data-end=\"3400\" data-start=\"3370\"\u003eMinimized gradients and simplified post processing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"3563\" data-start=\"3402\"\u003eWhether you're imaging nebulae, galaxies, or Milky Way panoramas, the Spectral Pro delivers a consistent, high-contrast result from city suburbs to dark sites.\u003c\/p\u003e\n\u003cp data-end=\"3563\" data-start=\"3402\"\u003e \u003c\/p\u003e\n\u003cp data-end=\"3563\" data-start=\"3402\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eZero Compromise Optical Design\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"3778\" data-start=\"3610\"\u003eMost 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:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli data-end=\"3828\" data-start=\"3782\"\u003eSimulated in full optical design software\u003c\/li\u003e\n\u003cli data-end=\"3873\" data-start=\"3831\"\u003eTested across a wide range of systems\u003c\/li\u003e\n\u003cli data-end=\"3935\" data-start=\"3876\"\u003eOptimized to reduce mechanical and optical vignetting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"4061\" data-start=\"3937\"\u003eIf any vignetting remains, it’s likely due to non-uniform illumination inherent in your optical train—not from the filter.\u003c\/p\u003e\n\u003cp data-end=\"4061\" data-start=\"3937\"\u003e \u003c\/p\u003e\n\u003cp data-end=\"4061\" data-start=\"3937\"\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003eVersatile, for Advanced Setups\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"4061\" data-start=\"3937\"\u003eThanks to its spectral neutrality and optical precision, the Spectral Pro also functions as a \u003cstrong data-end=\"4220\" data-start=\"4200\"\u003eluminance filter\u003c\/strong\u003e 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.\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cspan\u003e\u003c\/span\u003e\n\u003c\/div\u003e","brand":"Leviathan","offers":[{"title":"Default Title","offer_id":57942544089433,"sku":"LEV-SPro-2","price":869.95,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0249\/6213\/8192\/files\/Spectral_pro.jpg?v=1777369963"}],"url":"https:\/\/ktectelescopes.ie\/collections\/leviathan-optical-filters.oembed","provider":"Ktec Telescopes Ltd","version":"1.0","type":"link"}