{"id":26541,"date":"2023-02-02T19:11:34","date_gmt":"2023-02-02T15:11:34","guid":{"rendered":"https:\/\/astronomicalsolutions.com\/?post_type=product&#038;p=26541"},"modified":"2023-02-02T19:11:36","modified_gmt":"2023-02-02T15:11:36","slug":"guidestar-61-apo","status":"publish","type":"product","link":"https:\/\/astronomicalsolutions.com\/staging\/product\/guidestar-61-apo\/","title":{"rendered":"GuideStar 61 APO"},"content":{"rendered":"<p>The William Optics Guidestar 61 APO (Apochromatic) <a class=\"wpil_keyword_link\" href=\"https:\/\/astronomicalsolutions.com\/product-category\/telescopes\/\"   title=\"telescope\" data-wpil-keyword-link=\"linked\">telescope<\/a> is a 61mm refractor telescope that is optimized for deep-sky and planetary observations. It features a doublet objective lens made of FPL-53 ED glass, which provides excellent color correction and sharp images. The telescope&#8217;s compact design and portability make it a popular choice for amateur astronomers. Additionally, the Guidestar 61 APO has a dual-speed 10:1 focuser for precise focusing and a built-in electronic focusing system for easier guiding during long exposure astrophotography.<\/p>\n<h4>Ohara FPL-53 vs FPL-51 ED Glass<\/h4>\n<p>The dispersion properties of ED and SD glass elements are important in determining the overall colour correction. The abbe index is used to quantify the &#8216;partial dispersion&#8217; of a particular glass. Pure Fluorite\u00a0offers the highest partial dispersion at around 94.99 V, Ohara FPL-53 glass is very close to Fluorite\u00a0at 94.93 V and is often referred to as Synthetic Fluorite. \u00a0FPL-53 is also noticeably better than Ohara&#8217;s lower spec&#8217; FPL-51 glass which offers an abbe index of 81.54 V.<\/p>\n<h4>Specification<\/h4>\n<ul>\n<li>Focal Length: 360mm<\/li>\n<li>Diameter: 61mm<\/li>\n<li>Focal Ratio: F5.9<\/li>\n<li>Tube Length: 340mm<\/li>\n<li>Tube Weight: 1.44kg<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>The William Optics Guidestar 61 APO (Apochromatic) <a class=\"wpil_keyword_link\" href=\"https:\/\/astronomicalsolutions.com\/product-category\/telescopes\/\"   title=\"telescope\" data-wpil-keyword-link=\"linked\">telescope<\/a> is a 61mm refractor telescope that is optimized for deep-sky and planetary observations. It features a doublet objective lens made of FPL-53 ED glass, which provides excellent color correction and sharp images. The telescope&#8217;s compact design and portability make it a popular choice for amateur astronomers. Additionally, the Guidestar 61 APO has a dual-speed 10:1 focuser for precise focusing and a built-in electronic focusing system for easier guiding during long exposure astrophotography.<\/p>\n","protected":false},"featured_media":26542,"comment_status":"open","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"product_cat":[27,532],"product_tag":[],"class_list":{"0":"post-26541","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-telescopes","7":"product_cat-refractors","8":"desktop-align-center","9":"tablet-align-left","10":"mobile-align-left","11":"ast-product-gallery-layout-horizontal-slider","12":"ast-product-gallery-with-no-image","13":"ast-product-tabs-layout-vertical","14":"ast-qv-on-image","16":"first","17":"onbackorder","18":"taxable","19":"shipping-taxable","20":"purchasable","21":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/astronomicalsolutions.com\/staging\/wp-json\/wp\/v2\/product\/26541"}],"collection":[{"href":"https:\/\/astronomicalsolutions.com\/staging\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/astronomicalsolutions.com\/staging\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/astronomicalsolutions.com\/staging\/wp-json\/wp\/v2\/comments?post=26541"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/astronomicalsolutions.com\/staging\/wp-json\/wp\/v2\/media\/26542"}],"wp:attachment":[{"href":"https:\/\/astronomicalsolutions.com\/staging\/wp-json\/wp\/v2\/media?parent=26541"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/astronomicalsolutions.com\/staging\/wp-json\/wp\/v2\/product_cat?post=26541"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/astronomicalsolutions.com\/staging\/wp-json\/wp\/v2\/product_tag?post=26541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}