{"product_id":"antlia-prisma-herschel-cak-3nm-125","title":"Antlia Herschel Wedge with CaK 3nm Filter 1.25\"","description":"\u003ch2\u003eAntlia Herschel Wedge with CaK 3nm Filter 1.25\" – Complete System for Solar Imaging\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAntlia Herschel wedge with integrated CaK 3nm filter\u003c\/strong\u003e replaces the standard diagonal at the rear of refractor telescopes, enabling high-contrast imaging of solar granulation and sunspots. The Herschel wedge design is well known for producing sharper, higher-contrast images than other solar light-reduction systems.\u003c\/p\u003e\n\u003cp\u003eThe wedge transmits a reduced, safe amount of light to the camera; image brightness can be conveniently adjusted via a control ring with aperture blades, similar to that used in camera lenses. Built with CNC machining and multi-coated anti-reflection optical components to minimize internal reflections and stray light, the system integrates an ultra-narrow band Antlia filter of \u003cstrong\u003e3nm\u003c\/strong\u003e, centered on the Calcium II K line at \u003cstrong\u003e393.3nm\u003c\/strong\u003e, mounted in a standard 1.25\" holder. Unlike other designs that may overheat, the Antlia wedge directs excess energy into an extra-thick polycrystalline ceramic diffuser at the rear, with cooling vents for effective heat dissipation.\u003c\/p\u003e\n\u003cp\u003eThe system includes a right-angle prism, CaK filter, solar finder for centering the sun, and heat dissipation system. \u003cstrong\u003eIntended for imaging only\u003c\/strong\u003e: not suitable for visual observation nor for solar prominence imaging. For use only with refractor telescopes (maximum aperture 120mm, minimum focal ratio f\/5.5) to avoid damage to the instrument.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e35mm Herschel prism with integrated ceramic diffuser for heat dissipation\u003c\/li\u003e\n\u003cli\u003eCaK 3nm 393.3nm filter screwed into the eyepiece holder base\u003c\/li\u003e\n\u003cli\u003eBrightness control with variable aperture ring\u003c\/li\u003e\n\u003cli\u003eIntegrated solar finder for quickly centering the sun\u003c\/li\u003e\n\u003cli\u003eAnti-reflection (AR) coating on prism and filter\u003c\/li\u003e\n\u003cli\u003eSturdy CNC construction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eProduct type\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eHerschel wedge with integrated CaK filter\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eFilter wavelength\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e393.3nm (Calcium II K)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eBandpass (FWHM)\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e3nm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eOut-of-band blocking\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eOD5 (0.001%) @ 200–1200nm; OD3 (0.1%) @ 1200–1500nm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eFormat\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e35mm prism, 1.25\" filter (M28.5x0.6)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eRefractors only, max aperture 120mm, f\/5.5 or slower\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003ePrism, CaK 3nm filter, solar finder, brightness control, ceramic diffuser\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eIntended use\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eImaging only, not for visual observation or prominences\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003e1 year\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Antlia","offers":[{"title":"Default Title","offer_id":58540687327563,"sku":"ANA-PRISM-CAK3","price":439.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/ABUIABACGAAg1qSyigYoseHcmQMwoAY4oAY_600x600_ae714a4d-ee06-4970-ae6a-672772ae7ec2.jpg?v=1790069796","url":"https:\/\/adriasky.it\/en\/products\/antlia-herschel-wedge-cak-3nm-125","provider":"Adriasky","version":"1.0","type":"link"}