{"product_id":"william-optics-fluorostar-91","title":"William Optics Fluorostar 91","description":"\u003cp\u003eA precision-engineered apochromatic triplet refractor designed for discerning astronomers and astrophotographers. This mid-sized telescope features a 91mm aperture with FPL-53 glass, delivering sharp, high-contrast images and an impressive Strehl ratio exceeding 0.95.\u003c\/p\u003e\n\u003cp\u003eEquipped with user-centric features, the FLT91 includes an integrated saddle handle, a 360º field rotator, a dual-speed 3.3\" Rack \u0026amp; Pinion focuser, and a 2\" Rotolock system. These enhance usability and provide stability for both visual and photographic applications.\u003c\/p\u003e\n\u003cp\u003eAstrophotographers will find the built-in Bahtinov mask invaluable for achieving perfect focus effortlessly. Compatible with the Flat 6AIII, Flat 68III, and Ultra Flat 91, the FLT91 allows precise back-focus adjustments.\u003c\/p\u003e\n\u003cp\u003eConstructed with William Optics' signature quality, the FLT91 is both lightweight and durable, weighing 4.2 kg and 5.6 kg fully equipped. It comes with a soft carry case for easy transportation and protection.\u003c\/p\u003e\n\u003cp\u003eIdeal for capturing celestial phenomena, the William Optics FLT91 is a top choice for those seeking advanced optical performance in a portable package.\u003c\/p\u003e\n\u003cdiv class=\"static-tabs__nav\"\u003e\u003cstrong\u003e\u003clabel class=\"static-tabs__tab-label h5\" for=\"tab-trigger-static_tab_item_6iKGhz\"\u003eSpecification; \u003c\/label\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv class=\"static-tabs__content-wrapper\"\u003e\n\u003cdiv id=\"content-static_tab_item_6iKGhz\" class=\"static-tabs__content prose\"\u003e\n\u003cdiv class=\"definition specification\"\u003e\n\u003cdl\u003e\n\u003cdt\u003e\u003cstrong\u003eLens Type\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eTriplet APO Prime Lens\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eFocal Length\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e540 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e91 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eFocal Ratio\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003ef\/5.9\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eImage Circle\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e43 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eFocuser\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003e3.3\" R\u0026amp;P Focuser\u003c\/span\u003e \u003cspan\u003eCompatible with EAF\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eFocuser Travel\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e95 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eAdapter Included\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eM92 Rotator\u003c\/span\u003e \u003cspan\u003eM92 Extender\u003c\/span\u003e \u003cspan\u003eM92 → 2\" RotoLock\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eOptional Flattener\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eFLAT 68III 1.0x (requires adapter)\u003c\/span\u003e \u003cspan\u003eFLAT 6AIII 0.8x (requires adapter)\u003c\/span\u003e \u003cspan\u003eUltra Flat 91 0.79x\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eCamera Format\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e\n\u003cspan\u003eFull Frame\u003c\/span\u003e \u003cspan\u003eAPS-C\u003c\/span\u003e \u003cspan\u003eM4\/3\u003c\/span\u003e\n\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eDovetail Type\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003eVixen\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eTube Length\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e441 mm - 510 mm\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eOTA Weight\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e4.16 kg \/ 9.17 lbs\u003c\/dd\u003e\n\u003cdt\u003e\u003cstrong\u003eTotal Weight\u003c\/strong\u003e\u003c\/dt\u003e\n\u003cdd\u003e5.57 kg \/ 12.28 lbs\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003cp\u003e\u003cstrong\u003e\u003clabel class=\"static-tabs__tab-label h5\" for=\"tab-trigger-static_tab_item_PKd6ga\"\u003eDiagram Reports;\u003c\/label\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_FLT-91_Flat91.jpg?v=1726131906\" target=\"_blank\"\u003e\u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/Diagram_FLT-91_Flat91.jpg?v=1726131906\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/FLT-91_Flat6AIII-Diagram-1.jpg?v=1711333767\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/FLT-91_Flat6AIII-Diagram-1.jpg?v=1711333767\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/FLT-91_Flat68III-Diagram-1.jpg?v=1711333767\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/FLT-91_Flat68III-Diagram-1.jpg?v=1711333767\"\u003e\u003c\/a\u003e\u003ca href=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/FLT-91-Diagram-2.jpg?v=1711333767\" target=\"_blank\"\u003e \u003cimg class=\"filter-invert-bw\" width=\"100%\" height=\"auto\" src=\"https:\/\/williamoptics.com\/cdn\/shop\/files\/FLT-91-Diagram-2.jpg?v=1711333767\"\u003e\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"William Optics","offers":[{"title":"Red","offer_id":54129406050618,"sku":null,"price":199800.0,"currency_code":"INR","in_stock":false},{"title":"Gold","offer_id":54129406083386,"sku":null,"price":199800.0,"currency_code":"INR","in_stock":false},{"title":"Gray","offer_id":54129406116154,"sku":null,"price":199800.0,"currency_code":"INR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0691\/1456\/0826\/files\/n1_81e7bf25-871a-469a-8602-6a96cc3fbc7c.webp?v=1790320516","url":"https:\/\/edisla.in\/products\/william-optics-fluorostar-91","provider":"EDISLA","version":"1.0","type":"link"}