{"id":302,"date":"2019-10-09T23:00:27","date_gmt":"2019-10-09T23:00:27","guid":{"rendered":"http:\/\/eilialand.com\/transcript\/?post_type=activity&#038;p=302"},"modified":"2019-10-15T23:25:54","modified_gmt":"2019-10-15T23:25:54","slug":"telescope-collumation","status":"publish","type":"activity","link":"http:\/\/eilialand.com\/transcript\/activity\/telescope-collumation\/","title":{"rendered":"Telescope Collumation"},"content":{"rendered":"\n<p>A Newtonian telescope has 2 mirrors which occasionally go out of alignment. Alligning the mirrors of a telescope is called &#8220;Collumation&#8221;.  A &#8216;laser collumator&#8217; eyepiece helps with the alignment.  After inserting the collumator into the eyepiece holder and turning on the laser, we aligned the secondary mirror to the primary mirror using small hex wrench on the 3 adjustment screws to move the red dot into the center of the primary mirror.  Next we aligned the primary mirror by turning the adjustment thumb screws on the back of the optical tube assembly (OTA) &#8211; and sighting the returned laser dot on the target at the side of the collumation device.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"512\" src=\"http:\/\/eilialand.com\/transcript\/wp-content\/uploads\/2019\/10\/20191009_164612-1024x512.jpg\" alt=\"\" class=\"wp-image-303\" srcset=\"http:\/\/eilialand.com\/transcript\/wp-content\/uploads\/2019\/10\/20191009_164612-1024x512.jpg 1024w, http:\/\/eilialand.com\/transcript\/wp-content\/uploads\/2019\/10\/20191009_164612-300x150.jpg 300w, http:\/\/eilialand.com\/transcript\/wp-content\/uploads\/2019\/10\/20191009_164612-768x384.jpg 768w, http:\/\/eilialand.com\/transcript\/wp-content\/uploads\/2019\/10\/20191009_164612-100x50.jpg 100w, http:\/\/eilialand.com\/transcript\/wp-content\/uploads\/2019\/10\/20191009_164612-150x75.jpg 150w, http:\/\/eilialand.com\/transcript\/wp-content\/uploads\/2019\/10\/20191009_164612-200x100.jpg 200w, http:\/\/eilialand.com\/transcript\/wp-content\/uploads\/2019\/10\/20191009_164612-450x225.jpg 450w, http:\/\/eilialand.com\/transcript\/wp-content\/uploads\/2019\/10\/20191009_164612-600x300.jpg 600w, http:\/\/eilialand.com\/transcript\/wp-content\/uploads\/2019\/10\/20191009_164612-900x450.jpg 900w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>See the red dot in the center ring of the primary mirror.<\/figcaption><\/figure><\/div>\n","protected":false},"featured_media":304,"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-302","activity","type-activity","status-publish","has-post-thumbnail","hentry"],"_links":{"self":[{"href":"http:\/\/eilialand.com\/transcript\/wp-json\/wp\/v2\/activity\/302","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/eilialand.com\/transcript\/wp-json\/wp\/v2\/activity"}],"about":[{"href":"http:\/\/eilialand.com\/transcript\/wp-json\/wp\/v2\/types\/activity"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/eilialand.com\/transcript\/wp-json\/wp\/v2\/media\/304"}],"wp:attachment":[{"href":"http:\/\/eilialand.com\/transcript\/wp-json\/wp\/v2\/media?parent=302"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/eilialand.com\/transcript\/wp-json\/wp\/v2\/categories?post=302"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/eilialand.com\/transcript\/wp-json\/wp\/v2\/tags?post=302"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}