{"product_id":"gunfire-1152189606-25mm-kellner-eyepiece-1-25","title":"25mm Kellner eyepiece 1,25”","description":"\u003cp lang=\"en-US\"\u003e\u003cspan style=\"font-size: 12pt;\"\u003e\u003cstrong\u003eKellner eyepiece 25mm 1,25\"\u003c\/strong\u003e\u003cem\u003e\u003cspan style=\"font-variant: normal;\"\u003e\u003cspan style=\"font-style: normal;\"\u003e\u003cspan style=\"font-weight: normal;\"\u003e \u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp style=\"margin-bottom: 0cm;\"\u003e\u003cspan style=\"font-size: 12pt;\"\u003e\u003cem\u003e\u003cspan style=\"font-variant: normal;\"\u003e\u003cspan style=\"font-style: normal;\"\u003e\u003cspan style=\"font-weight: normal;\"\u003eKellner eyepiece is an improved version of the Ramsden eyepiece. Instead of a single eyepiece lens, an achromatic double lens was used, which significantly reduced chromatic aberration. The first lens is biconvex or plano-convex. In order to minimise chromatic aberration and blurring on the edge of the visual field, the lens is fitted to the focal plane of the objective.\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp style=\"margin-bottom: 0cm;\"\u003e\u003cspan style=\"font-size: 12pt;\"\u003e\u003cem\u003e\u003cspan style=\"font-variant: normal;\"\u003e\u003cspan style=\"font-style: normal;\"\u003e\u003cspan style=\"font-weight: normal;\"\u003eClear and bright images are characteristic for the long focal-length Kellner eyepieces. Use of three eyepieces enables getting a reasonably good field of view of 40-50 degrees.\u003c\/span\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/em\u003e\u003c\/span\u003e\u003c\/p\u003e \u003cp style=\"margin-bottom: 0cm;\" lang=\"en-US\"\u003e \u003c\/p\u003e","brand":"OPT","offers":[{"title":"Default Title","offer_id":58623382749568,"sku":"OPT-38-000111-00","price":8.61,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1006\/3596\/7872\/files\/51adbfdb6e6f4b8a568600515f4ab491cb5df581_1152189606_1_e016b1fe-f3ee-4b4d-9802-2783b6e35332.webp?v=1786998238","url":"https:\/\/sectordefence.com\/products\/gunfire-1152189606-25mm-kellner-eyepiece-1-25","provider":"sector defence","version":"1.0","type":"link"}