{"id":1018,"date":"2014-01-17T10:20:28","date_gmt":"2014-01-17T08:20:28","guid":{"rendered":"http:\/\/www.astrobobo.net\/?p=1018"},"modified":"2023-07-12T08:48:14","modified_gmt":"2023-07-12T06:48:14","slug":"sunce-u-h-alpha-spektru","status":"publish","type":"post","link":"http:\/\/www.astrobobo.net\/?p=1018","title":{"rendered":"Sunce u h-alpha spektru"},"content":{"rendered":"<p>Koliko god da je ovih dana vani toplo, rijetko se pogodi da bude zbilja vedro po danu. Naime, nedavno sam svoj stari Intes teleskop mijenjao za specijalizirani teleskop za promatranje Sunca &#8211; <a href=\"http:\/\/luntsolarsystems.com\/site\/visual-package.html\" target=\"_blank\" rel=\"noopener\">Lunt 60<\/a>. Promjer objektiva je 60mm \u0161to se mo\u017eda \u010dini malo, no dosta je vi\u0161e od popularnog Coronado PST-a koji ima 40mm. Va\u017enija je propusnost filtera &#8211; 0.7 \u00c5. To zna\u010di da \u0107e se vidjeti odli\u010dni detalji na povr\u0161ini Sunca, a tako\u0111er i protuberance koje vire sa ruba.<\/p>\n<p>Ju\u010der (16.1.2014.) oblaci su se razmaknuli pa sam ugrabio priliku za promatranje i fotkanje. Moj jedini poku\u0161aj prije toga bio je sa Nikonom D600, a ovaj puta sam fotkao sa D5100. Modificiran je te ima znatno ve\u0107u propusnost u h-alpha dijelu spektra. Zbog toga mogu koristiti manju ISO osjetljivost i kra\u0107e ekspozicije. Osim toga, D5100 puno je lak\u0161i od D600 te ima prakti\u010dni pomi\u010dni ekran.<\/p>\n<p style=\"text-align: left;\"><a href=\"http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2009\/11\/Sunce_20140116_stack_obrada.jpg\"><img fetchpriority=\"high\" decoding=\"async\" data-attachment-id=\"1016\" data-permalink=\"http:\/\/www.astrobobo.net\/?attachment_id=1016\" data-orig-file=\"http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2009\/11\/Sunce_20140116_stack_obrada.jpg\" data-orig-size=\"900,900\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;}\" data-image-title=\"Sunce, 16.1.2014.\" data-image-description=\"&lt;p&gt;Sunce, 16.1.2014.&lt;\/p&gt;\n\" data-image-caption=\"\" data-large-file=\"http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2009\/11\/Sunce_20140116_stack_obrada.jpg\" class=\"aligncenter  wp-image-1016\" alt=\"Sunce, 16.1.2014.\" src=\"http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2009\/11\/Sunce_20140116_stack_obrada-300x300.jpg\" width=\"500\" height=\"500\" srcset=\"http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2009\/11\/Sunce_20140116_stack_obrada-300x300.jpg 300w, http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2009\/11\/Sunce_20140116_stack_obrada-200x200.jpg 200w, http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2009\/11\/Sunce_20140116_stack_obrada.jpg 900w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/a>Kod fotografiranja Sunca u h-alpha spektru potrebno je posebno kombinirati snimku povr\u0161ine Sunca i rubova (protuberanci) jer je sun\u010dev disk znatno sjajniji. U obradi sam koristio samo crveni kanal jer h-alpha spektar je u tom dijelu spektra na 656nm. Boja je dodana naknadno, prema <a href=\"http:\/\/www.photosbykev.com\/wordpress\/photography\/pst-solar-imaging\/\" target=\"_blank\" rel=\"noopener\">uputama Kevina Lewisa<\/a>.<\/p>\n<p style=\"text-align: left;\">Vizualno, Sunce je izgledalo odli\u010dno! Vidjeli su se svi detalji kao na fotografiji, samo je slika (naravno) izrazito crvena. Naro\u010dito impresivna bila je protuberanca desno dolje koja je formirala ogroman luk &#8211; na \u017ealost intenzitet joj se smanjio kada sam po\u010deo fotografirati. Teleskop sam postavio na Cmroku. Nije bilo puno \u0161eta\u010da, no dvojica prisutnih su rado pogledali kroz teleskop i prizor im se jako svidio.<\/p>\n<p style=\"text-align: left;\">Nadam se uskoro ponoviti pothvat uz jo\u0161 bolje rezultate \ud83d\ude0e<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Koliko god da je ovih dana vani toplo, rijetko se pogodi da bude zbilja vedro po danu. Naime, nedavno sam svoj stari Intes teleskop mijenjao za specijalizirani teleskop za promatranje Sunca &#8211; Lunt 60. Promjer objektiva je 60mm \u0161to se mo\u017eda \u010dini malo, no dosta je vi\u0161e od popularnog Coronado PST-a koji ima 40mm. Va\u017enija [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1016,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"gallery","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[88,67,54],"class_list":["post-1018","post","type-post","status-publish","format-gallery","has-post-thumbnail","hentry","category-astrofotografija","tag-astrofotografija","tag-lunt","tag-sunce","post_format-post-format-gallery"],"acf":[],"aioseo_notices":[],"jetpack_featured_media_url":"http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2009\/11\/Sunce_20140116_stack_obrada.jpg","amp_enabled":true,"_links":{"self":[{"href":"http:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/posts\/1018","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.astrobobo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1018"}],"version-history":[{"count":4,"href":"http:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/posts\/1018\/revisions"}],"predecessor-version":[{"id":3429,"href":"http:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/posts\/1018\/revisions\/3429"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/media\/1016"}],"wp:attachment":[{"href":"http:\/\/www.astrobobo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1018"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.astrobobo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1018"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.astrobobo.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1018"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}