{"product_id":"heliopan-55mm-green-filter-13-schott-glass-for-b-w-photography","title":"Heliopan 55mm Green Filter (13) Schott Glass for B+W Photography","description":"\u003cp\u003e\u003cstrong\u003eItem Includes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHeliopan #13 Green Filter\u003c\/li\u003e\n\u003cli\u003eManufacturer Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eOverview\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe Heliopan #13 Green Filter is a specialized optical contrast filter dedicated to black-and-white film photography. By manipulating tonal values—darkening reds and blues while lightening greens—it provides enhanced contrast and subject separation for outdoor landscapes and portrait photography.\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTonal Manipulation: Lightens greens while darkening blue and red tones for distinct monochrome contrast.\u003c\/li\u003e\n\u003cli\u003ePrecision Glass: Built with premium German Schott glass to ensure optimal clarity and structural integrity.\u003c\/li\u003e\n\u003cli\u003ePremium Brass Frame: Heavy-duty brass ring construction maximizes durability and completely prevents cross-threading.\u003c\/li\u003e\n\u003cli\u003eReflection Suppression: Features a single anti-reflection layer on both front and rear surfaces to combat glare.\u003c\/li\u003e\n\u003cli\u003eGhosting Control: Specially engineered to significantly reduce lens flare, scattered light, and internal ghosting.\u003c\/li\u003e\n\u003cli\u003eProtective Coating: Anti-reflective layers double as a barrier to keep the glass substrate cleaner for longer.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cbr\u003e\n\u003cp\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eFilter Type: Contrast Filter (#13 Green)\u003c\/li\u003e\n\u003cli\u003eApplication: Black-and-White Film Photography\u003c\/li\u003e\n\u003cli\u003eManufacturer: HELIOPAN\u003c\/li\u003e\n\u003cli\u003eFilter Factor: 3x (requires a manual exposure increase of 1.5 stops)\u003c\/li\u003e\n\u003cli\u003eSubstrate Material: Schott Optical Glass\u003c\/li\u003e\n\u003cli\u003eRing Material: Solid Brass\u003c\/li\u003e\n\u003cli\u003eCoating Type: Single-layer anti-reflection (both sides)\u003c\/li\u003e\n\u003cli\u003eCountry of Origin: Germany\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Heliopan","offers":[{"title":"Default Title","offer_id":51411796984103,"sku":"10131055","price":9495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0877\/0597\/7127\/files\/green13_4937ab77-1ac2-440b-a1c2-aeac1b65ba92.jpg?v=1779219495","url":"https:\/\/cambridgeworld.com\/products\/heliopan-55mm-green-filter-13-schott-glass-for-b-w-photography","provider":"Cambridge World Inc","version":"1.0","type":"link"}