{"product_id":"william-optics-new-internal-focus-design-gran-turismo-81-wifd-gt81-wifd","title":"William Optics NEW Internal Focus Design Gran Turismo 81 WIFD + Flattener + Guide Scope (GT81-WIFD-AP)","description":"\u003ch1 class=\"productView-title\"\u003eWilliam Optics GT81 Internal Focus Design WIFD Apochromatic Series\u003c\/h1\u003e\n\u003cdiv role=\"tabpanel\" class=\"data item content\" id=\"description\"\u003e\n\u003cdiv class=\"product attribute description\"\u003e\n\u003ch2 class=\"hero__heading\"\u003e\u003cstrong\u003eTHE NEW GAME CHANGER\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cp\u003eIntroducing the WILLIAM OPTICS Internal Focus Design (WIFD) Apochromatic Series. This innovative and revolutionary design combines a precision (Patented) internal focusing mechanism with the highest quality optics available, providing the ultimate Apochromatic refractor for astrophotography. Designed from the ground up with the ability to handle the newest generation of large, heavy, high-resolution cooled cameras, the rock-solid optical tube assembly is uncompromised in quality. The movement of the focuser is integrated inside the main tube assembly, so there are no movements of a focuser drawtube visible from the outside.  The user can enjoy the benefits of a traditional two speed fine focuser, while not worrying about limitations typically found in traditional rear mounted focusers. \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/thenewwifd_480x480.png?v=1675873568\" alt=\"\" width=\"615\" height=\"260\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/WIFDfocuserdesign_480x480.png?v=1675873667\" alt=\"\" width=\"549\" height=\"263\"\u003e\u003c\/p\u003e\n\u003ch2\u003eINTERNAL FOCUSER DESIGN\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eNEW internal focuser.  Our new design includes the Patented WO center focuser with precise internal sliding of fixed optics to prevent image shift.  The integrated position viewing window on the focuser provides instant verification of the graduated numerical display.  The smooth rack and pinion design is incorporated into the focuser to provide super fine adjustability for critical focus.  The internal movement of the optical elements is protected from the elements and can’t come out of alignment.  The redistribution of weight allows for better balance during imaging sessions.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp style=\"margin: 0px 0px 1rem; padding: 0px; color: #333333; font-family: 'Open Sans', Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/WIFDFOCUSER_480x480.gif?v=1675873830\" alt=\"\" width=\"627\" height=\"419\"\u003e\u003c\/p\u003e\n\u003ch2\u003eDESIGN PRINCIPLE\u003c\/h2\u003e\n\u003cp\u003eScalable Design.  The WIFD series will allow for many sizes and is not limited to smaller refractors.   Additional optical designs are possible to meet various photographic requirements enhancing the line to include a number of apertures and fast focal ratios.\u003cbr\u003e\u003cbr\u003eInspired by the tremendous success of the WO CAT series of astrographs, William Optics has advanced the capabilities of astrophotography to the next level with this “no weight limit on photo accessories” design.  The solid tube where accessories are attached, has a rigid design, and will not flex or exhibit any change in the optical path regardless of the weight of the camera and filter wheel attached to it.\u003c\/p\u003e\n\u003cp style=\"margin: 0px 0px 1rem; padding: 0px; color: #333333; font-family: 'Open Sans', Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/WIFDdesign_480x480.png?v=1675873934\" alt=\"\" width=\"640\" height=\"304\"\u003e\u003c\/p\u003e\n\u003ch2\u003eCAT DESIGN\u003c\/h2\u003e\n\u003cp\u003eImproved “CAT” design ring tubes and dovetail base are lighter while remaining equally rigid. The new design allows for better balance with heavy accessories, and has integral placement of the focuser knobs, providing easy access to focusing during imaging.  Included is the popular WO Saddle Bar Handle, critical for rigid guidescope mounting and autoguiding performance.\u003cbr\u003e\u003cbr\u003eSuper Smooth Field Rotator.  Our field rotator design features smooth camera rotation with markings for degrees and a locking thumbscrew to prevent accidental camera movement,also new Electric Rotator will be available in near future.\u003c\/p\u003e\n\u003cp style=\"margin: 0px 0px 1rem; padding: 0px; color: #333333; font-family: 'Open Sans', Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/WIFDcatdesign_480x480.png?v=1675874349\" alt=\"\" width=\"620\" height=\"292\"\u003e\u003c\/p\u003e\n\u003ch2 style=\"margin: 0px 0px 1rem; padding: 0px; color: #333333; font-family: 'Open Sans', Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003eZYGO TEST REPORT\u003c\/h2\u003e\n\u003cp style=\"margin: 0px 0px 1rem; padding: 0px; color: #333333; font-family: 'Open Sans', Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/WIFDtestreport_480x480.png?v=1675874553\" alt=\"\" style=\"float: left;\" width=\"560\" height=\"344\"\u003e\u003c\/p\u003e\n\u003cp style=\"margin: 0px; padding: 0px; color: #333333; font-family: 'Open Sans', Arial, 'Helvetica Neue', Helvetica, sans-serif; font-size: 17px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/WIFDSEIGN2_480x480.png?v=1675874930\" alt=\"\" width=\"597\" height=\"302\"\u003e\u003c\/p\u003e\n\u003cbr\u003e\n\u003cdiv class=\"value\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv class=\"definition\"\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eLens Type :\u003c\/strong\u003e Triplet Apochromatic Prime Lens\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eFocal Length : \u003c\/strong\u003e478mm\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eDiameter: \u003c\/strong\u003e81mm\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eF\/ Ratio :\u003c\/strong\u003e f\/5.9\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eOptional Flattener : \u003c\/strong\u003eFLAT6AIII 0.8x \/ FLAT68III 1.0X\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eFocuser :\u003c\/strong\u003e WIFD \/ Compatible with EAF\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eColor :\u003c\/strong\u003e Red\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eLens Material : \u003c\/strong\u003eFPL-53\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eStrehl Ratio :\u003c\/strong\u003e 0.95+\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eCamera Format : \u003c\/strong\u003eFull Frame \/ DSLR \/ Mirrorless \/ CMOS \/ CCD\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eTest Report :\u003c\/strong\u003e Included\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003cdl\u003e\n\u003cdt\u003e\n\u003cstrong\u003eT-Mounts Supported\u003c\/strong\u003e \u003cstrong\u003e: \u003c\/strong\u003eCanon EF, RF \/ Nikon F, Z \/ Sony E \/ Pentax K \/ Micro Four Thirds (M4\/3) \/ FUJI X\u003c\/dt\u003e\n\u003c\/dl\u003e\n\u003c\/div\u003e\n\u003cbr\u003e\n\u003ch3\u003eIn the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWilliam Optics WIFD Gran Turismo 81\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTest Report\u003c\/li\u003e\n\u003cli\u003eCarrying Bag\u003c\/li\u003e\n\u003cli\u003eFlattener\u003c\/li\u003e\n\u003cli\u003eGuide scope\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003ePlease Note : Rotolock and Flattener are optional Not Included\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003ch3\u003eWarranty \u0026amp; Manuals\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/william-optics-warranty\" target=\"_blank\"\u003eWilliam Optics 2-Year Warranty\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/istronomyplus.com\/pages\/william-optics-f-a-q\" target=\"_blank\"\u003eWilliam Optics F.A.Q\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv role=\"tab\" class=\"data item title\" id=\"tab-label-additional\" tabindex=\"0\"\u003e\u003cbr\u003e\u003c\/div\u003e","brand":"William Optics","offers":[{"title":"Default Title","offer_id":46363602747621,"sku":"WO-T-GT-81RD-WIFD","price":2850.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0652\/6245\/2965\/files\/GT-81-WIFD-perspective-11.webp?v=1777048010","url":"https:\/\/istronomyplus.com\/products\/william-optics-new-internal-focus-design-gran-turismo-81-wifd-gt81-wifd","provider":"Astronomy Plus – Telescopes \u0026 Astrophotography Canada","version":"1.0","type":"link"}