{"product_id":"guidestar-61-f-5-9-apo","title":"WILLIAM OPTICS GUIDESTAR 61 F\/5.9 APO","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eThe William Optics GuideStar 61 is an\u003cstrong\u003e apochromatic guide scope \u003c\/strong\u003ewith a \u003cstrong\u003efocal ratio of f\/5.9\u003c\/strong\u003e and a \u003cstrong\u003efocal length of 360mm\u003c\/strong\u003e. Utilizing \u003cstrong\u003eFPL-53\u003c\/strong\u003e synthetic fluorite glass, the GuideStar 61 provides excellent aberration correction.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0071\/4935\/5059\/files\/img_5093.png?v=1778037871\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe GuideStar 61 is \u003c\/span\u003e\u003cstrong\u003ecompatible with QHY, Touptek ZWO and many other guide cameras (Note: some guide cameras may require an extra 2\" extension tube to reach focus)\u003c\/strong\u003e\u003cspan\u003e. The locking dew shield focuser allows you to easily reach the correct focus point. An extension tube is included to help reach focus with different cameras. The CNC-machined finder-style dovetail base is compatible with all William Optics saddle handles.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe GuideStar 61 can also be used as a widefield imaging telescope with the optional Flat61A field flattener.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: center;\"\u003e\u003cspan\u003e\u003cstrong\u003eNote: As the Flat61 an adjustable flattener, you must adjust the distance for your specific telescope. See the Instructions tab above.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003cp style=\"font-weight: 400;\"\u003e \u003c\/p\u003e\n\u003ctable style=\"font-weight: 400;\" class=\"specificationTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOptical design\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eApochromatic with FPL-53 lens\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eObjective diameter\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e61 mm\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFocal \u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003elength\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e360 mm\u003cbr\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eFocal ratio\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003ef\/5.9\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eCompatible flattener\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eWilliam Optics Flat61A\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eMount attachment\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eVixen-style sliding-base\u003cbr\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eFocuser\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cspan\u003eScrew-type focuser\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eCamera connection\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eM54 x 0.75, 2\"\u003cbr\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eTube weight\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e1.44 kg\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003eWO-M-GS61-GD (Gold), WO-M-GS61-RD (Red)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch5 style=\"text-align: left;\"\u003eIncluded items\u003c\/h5\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGuideStar 61\u003c\/li\u003e\n\u003cli\u003eFinder sliding-base\u003c\/li\u003e\n\u003cli\u003eM54 to 2\" adapter\u003c\/li\u003e\n\u003cli\u003eExtension tube\u003c\/li\u003e\n\u003cli\u003eSoft carry case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003eInstructions\u003c\/h5\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote: Once you have unscrewed the rear adapter to the appropriate value in the table below, the remaining backfocus distance to make up will be 55mm from the rear M48 thread.\u003c\/strong\u003e  \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDistance adjustment needed for correct backfocus\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable class=\"specificationTable\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003e\u003cspan\u003eZenithstar 61\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd\u003e\u003cspan\u003e12.9 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left;\"\u003e\u003cspan\u003eGuidestar 61\u003c\/span\u003e\u003c\/th\u003e\n\u003ctd\u003e\u003cspan\u003e12.9 mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0071\/4935\/5059\/files\/WO_Flat61_Step1_800.jpg?v=1680745595\" alt=\"\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0071\/4935\/5059\/files\/WO_Flat_Step2_800_3302fb8f-1820-4c7e-b390-86be0d3c3190.jpg?v=1679983936\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0071\/4935\/5059\/files\/WO_Flat_Step3_800.jpg?v=1679974177\"\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg style=\"display: block; margin-left: auto; margin-right: auto;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0071\/4935\/5059\/files\/GS61-6_800_ee31bd72-165a-4c75-bb4a-1c2a90b6391c.jpg?v=1648177075\"\u003e\u003c\/p\u003e","brand":"Testar Australia","offers":[{"title":"Gold","offer_id":40235926782144,"sku":"WO-M-GS61-GD","price":799.0,"currency_code":"AUD","in_stock":true},{"title":"Red","offer_id":40235926814912,"sku":"WO-M-GS61-RD","price":799.0,"currency_code":"AUD","in_stock":false},{"title":"Blue","offer_id":48393046294753,"sku":"WO-M-GS61-BU","price":799.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0071\/4935\/5059\/products\/img_5095_1000.jpg?v=1648103771","url":"https:\/\/www.testar.com.au\/products\/guidestar-61-f-5-9-apo","provider":"Testar Australia","version":"1.0","type":"link"}