{"product_id":"orion-optics-uk-250mm-f4-8-mirror","title":"Orion Optics UK 250mm F\/4.8 Mirror","description":"\u003cul class=\"DAV-feature-list\"\u003e\n\u003cli\u003e250mm aperture, f\/4.8\u003c\/li\u003e\n\u003cli\u003eStandard grade, 1\/4 PV wavefront accuracy\u003c\/li\u003e\n\u003cli\u003eHand-figured in the UK\u003c\/li\u003e\n\u003cli\u003eSupplied with a Zygo interferometer test report\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!-- more --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli class=\"active\"\u003eDescription\u003c\/li\u003e\n\u003cli\u003eSpecifications\u003c\/li\u003e\n\u003cli\u003eIn the Box\u003c\/li\u003e\n\u003cli\u003eWarranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\u003cli class=\"active\"\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section-center\"\u003e\n\u003ch2\u003e250mm f\/4.8 Standard Grade Primary Mirror\u003c\/h2\u003e\n\u003cp\u003eA 250mm f\/4.8 Newtonian primary mirror hand-figured by Orion Optics UK to Standard grade (1\/4 PV wavefront accuracy).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"DAV-bg-light\"\u003e\n\u003cdiv class=\"DAV-section\"\u003e\n\u003ch3\u003eWavefront-Accuracy Grading\u003c\/h3\u003e\n\u003cp\u003eOrion Optics UK hand-figures every primary mirror in-house to a wavefront-accuracy grade (Standard 1\/4 PV, Professional 1\/6 PV, Research 1\/8 PV, or Ultra 1\/10 PV) -- the smaller the fraction, the more precisely the surface matches a perfect parabola, and the sharper and higher-contrast the resulting image. Supplied with a Zygo interferometer test report.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ctable class=\"DAV-specifications\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAperture\u003c\/td\u003e\n\u003ctd\u003e250mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFocal ratio\u003c\/td\u003e\n\u003ctd\u003ef\/4.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrade\u003c\/td\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavefront accuracy\u003c\/td\u003e\n\u003ctd\u003e1\/4 PV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cul class=\"DAV-grid\"\u003e\n\u003cli class=\"DAV-grid-item\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"DAV-item-title\"\u003e250mm f\/4.8 Standard Primary Mirror\u003c\/p\u003e\n\u003cp class=\"DAV-item-subtitle\"\u003e× 1\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/davidastro.com\/pages\/orion-optics-uk-warranty-policy\" rel=\"noopener\" target=\"_blank\"\u003eOrion Optics UK 1-Year Warranty\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Orion Optics UK","offers":[{"title":"Standard (1\/4 PV)","offer_id":52942619214109,"sku":"OOUK-250MM-F4-8-STANDARD-1","price":858.0,"currency_code":"CAD","in_stock":true},{"title":"Professional (1\/6 PV)","offer_id":52942619246877,"sku":"OOUK-250MM-F4-8-PROFESSIONAL-1","price":1042.0,"currency_code":"CAD","in_stock":true},{"title":"Research (1\/8 PV)","offer_id":52942619279645,"sku":"OOUK-250MM-F4-8-RESEARCH-1","price":1172.0,"currency_code":"CAD","in_stock":true},{"title":"Ultra (1\/10 PV)","offer_id":52942619312413,"sku":"OOUK-250MM-F4-8-ULTRA-1","price":1622.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/5280\/1565\/files\/Orion-Optics-UK-Logo_c582af82-ac7a-4819-bf0e-6adc15af6486.jpg?v=1789608395","url":"https:\/\/davidastro.com\/products\/orion-optics-uk-250mm-f4-8-mirror","provider":"David Astro","version":"1.0","type":"link"}