{"product_id":"william-optics-fluorostar-91-t-flt-91","title":"William Optics Fluorostar 91 f\/5.9 Triplet Refractor (FLT-91)","description":"\u003ch1\u003eWilliam Optics Fluorostar 91\u003c\/h1\u003e\n\u003cp\u003eThe FLT 91 is the perfect Apochromatic refractor for visual and photographic astronomers demanding excellence in a midsize telescope. The three-element optical design features a 91mm aperture using FPL-53 glass. The STM-coatings and superb quality provide excellent optical performance and unmatched value.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eROTOLOCK\u003c\/strong\u003e\u003cbr\u003eThe Rotolock 2 inch adapter provides for a solid and efficient connection for a WO 2 inch diagonal, and other accessories.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBAHTINOV MASK Patented\u003c\/strong\u003e\u003cbr\u003eThe retractable dew shield features a removable lens cover, with our patented Bahtinov Mask revealed by unscrewing the face plate. The clear design allows for brighter star patterns, and precise focusing for astrophotography.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVersatile Saddle Bar Patented\u003c\/strong\u003e\u003cbr\u003eThe Saddle Bar Handle, offers a solid handle with a built in dovetail chamber for use with the WO Uniguide scopes, or other Vixen style guiding\/finder scopes.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eNew Focuser Knob\u003c\/strong\u003e\u003cbr\u003eA larger fit designed for better ergonomics.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eField Rotator\u003c\/strong\u003e\u003cbr\u003eThe super smooth field rotator includes markings for every degree, and a solid thumbscrew position lock.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eSoft Carry Case\u003c\/strong\u003e\u003cbr\u003eThe standard package comes with a soft carry case.\u003c\/p\u003e\n\u003cdiv class=\"value\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLens Type: Apochromatic Triplet Prime Lens\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFocal Length: 540mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDiameter: 91mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAperture: f\/5.9\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFocuser: Dual Speed 3.3\" R\u0026amp;P Focuser\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eColor: Red Space grey\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLens Material: FPL-53\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eStrehl Ratio: 0.95+\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eCamera Format: Full Frame DSLR \/ Mirrorless \/ CMOS \/ CCD\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTest Report: Zygo test report available at additional cost\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eT-Mounts Supported Canon EF, RF Nikon F, Z Sony E Pentax K Micro Four Thirds\u003c\/li\u003e\n\u003cli\u003e(M4\/3) FUJI X\u003cbr\u003eRetracted Length: 441mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eExtended Length: 510mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eExtension Tube Length: 40mm\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOTA Weight: 4.165Kg\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTotal Weight: 5.575Kg\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eExtension Tube: Weight 0.105Kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eIn the Box\u003c\/h3\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003eWilliam Optics Fluorostar 91\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e3.3\" Dual-Speed Rack \u0026amp; Pinion Focuser\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eBahtinov Mask Cover\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eVixen-Style Dovetail Saddle Plate\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eMounting Rings with Handle Bar\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eSoft Carry Case\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003eExtension Tube\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-mce-fragment=\"1\"\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/william-optics-warranty\" target=\"_blank\" data-mce-href=\"https:\/\/istronomyplus.com\/pages\/william-optics-warranty\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/william-optics-f-a-q\" target=\"_blank\" data-mce-href=\"https:\/\/istronomyplus.com\/pages\/william-optics-f-a-q\"\u003eWilliam Optics F.A.Q\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"William Optics","offers":[{"title":"Red","offer_id":43744542982373,"sku":"WO-T-FLT-91RD-RP33","price":3033.0,"currency_code":"CAD","in_stock":false},{"title":"Gold","offer_id":43744543015141,"sku":"WO-T-FLT-91GD-RP33","price":3033.0,"currency_code":"CAD","in_stock":false},{"title":"Grey","offer_id":43744543047909,"sku":"WO-T-FLT-91SG-RP33","price":3033.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/william-optics-fluorostar-91-f5-9-triplet-refractor-flt-91-astronomy-plus-1.webp?v=1690487119","url":"https:\/\/istronomyplus.com\/products\/william-optics-fluorostar-91-t-flt-91","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}