{"id":951,"date":"2017-03-28T10:37:33","date_gmt":"2017-03-28T08:37:33","guid":{"rendered":"https:\/\/www.primalucelab.com\/astronomy\/blog\/?p=951"},"modified":"2021-08-31T14:45:26","modified_gmt":"2021-08-31T12:45:26","slug":"celestron-edgehd-un-telescopio-versatile-molte-applicazioni-versatile-telescope-many-applications","status":"publish","type":"post","link":"https:\/\/www.primalucelab.com\/blog\/celestron-edgehd-un-telescopio-versatile-molte-applicazioni-versatile-telescope-many-applications\/","title":{"rendered":"Celestron EdgeHD: versatile telescope, many applications"},"content":{"rendered":"<p style=\"text-align: justify;\">Celestron EdgeHD telescopes are the evolution of classic Schmidt-Cassegrains: not only they can be used in visual (unlike the SC, they are perfect also\u00a0with very large\u00a0apparent field of view eyepieces) and for planetary and lunar photography but, thanks to dedicated focal reducers, they are great\u00a0instruments\u00a0for long-exposure astrophotography. In this article we will see how to use them for this\u00a0application and what are the advantages compared to other optical schemes often used by amateur astronomers like\u00a0the classic Schmidt-Cassegrains or Ritchey-Chretiens.<\/p>\n<p style=\"text-align: justify;\"><!--more--><\/p>\n<p style=\"text-align: justify;\">Celestron is famous worldwide for its line of Schmidt-Cassegrain telescopes that, since the 70s of the twentieth century really changed the world of amateur astronomy. But with the advent in recent years of wide-angle eyepieces and digital cameras (DSLR or CCD cameras) with large sensors (for example 23x15mm or 36x24mm) the optimal correction on axis\u00a0of SC telescopes was not enough and Celestron has faced the challenge of creating a more advanced optical design, also for digital astrophotography. By inserting a special corrector inside the optical tube, Celestron developed a special aplanatic\u00a0optical scheme, combining the advantages of the Corrected Dall-Kirkham (CDK) telescopes to those of the Schmidt-Cassegrain ones. By adding different mechanical improvements (such as the new internal baffles and a new design for\u00a0a greater illuminated field, the new primary mirror support with locking knobs to further reduce mirror shift and ventilation ports\u00a0with filter to reduce\u00a0mirror acclimatization time avoiding dust entering the tube), created the new Celestron EdgeHD line, modern telescopes with high-performance, universal, easy to use but also cost effective.<\/p>\n&nbsp;\n\n<figure id=\"attachment_957\" aria-describedby=\"caption-attachment-957\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-957 size-full\" src=\"https:\/\/www.primalucelab.com\/wp\/astronomy\/wp-content\/uploads\/sites\/4\/2017\/03\/Celetron_EdgeHD_articolo1_EN.jpg\" alt=\"Celestron EdgeHD: telescope rear cell features\" width=\"650\" height=\"400\" \/><figcaption id=\"caption-attachment-957\" class=\"wp-caption-text\">Celestron EdgeHD: telescope rear cell features<\/figcaption><\/figure>\n\n&nbsp;\n<p style=\"text-align: justify;\">Unlike other optical designs optimized for a particular application, Celestron\u00a0EdgeHD have the advantage of being really versatile\u00a0telescopes and they can therefore be used with great\u00a0results for many different applications:<\/p>\n\n<ul>\n \t<li style=\"text-align: justify;\"><em>Visual\u00a0use<\/em>: high optical quality combined with large flat\u00a0field makes them perfect for visual use also\u00a0with large apparent field of view eyepieces: stars will be point across\u00a0the whole field, really better than classic Schmidt-Cassegrain telescopes. Compared to Ritchey-Chretien telescopes, Celestron EdgeHD telescopes offer a greater contrast thanks to\u00a0lower obstruction.<\/li>\n \t<li style=\"text-align: justify;\"><em>Lunar and planetary astrophotography<\/em>: high optical quality of the optics along with high focal length and not too high obstruction\u00a0(less compared to Ritchey-Chretien telescopes), make the Celestron EdgeHD also excellent for lunar planetary imaging\u00a0with DSLR and dedicated planetary camera. In order to\u00a0obtain high magnifications just insert in the visual back, before the camera, a Barlow lens (usually with magnification factor between 2x and 4x) to obtain even higher\u00a0magnifications, and then record the finer details.<\/li>\n \t<li style=\"text-align: justify;\"><em>Deep-sky long exposure imaging\u00a0<em>astrophotography<\/em><\/em>: the dedicated 0.7x reducer\/corrector (which reduce\u00a0the focal ratio from f\/10 to f\/7), which is available for 8&#8243;, 11&#8243; and 14&#8243; models, is designed to keep a large corrected field\u00a0(it&#8217;s perfect also for APS-C type sensors with 27mm diagonal).\u00a0The secondary mirror of Celestron telescopes EdgeHD is supported by the corrector plate that not only closes the telescope (protecting more the internal optical elements) but also prevents the creation of diffraction <em>spikes<\/em> seen as crosses on bright stars, instead generated by Ritchey-Chretien telescopes because of large secondary mirror supports.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Now we analyze in detail how to use Celestron EdgeHD telescopes for deep-sky astrophotography by taking, as an example, the most compact model (EdgeHD 800) that offers high performance at an affordable price. The compact and lightweight design makes it perfect for those looking for an astrophotography\u00a0telescope easy to use even on not particularly large and expensive mounts. We also perform\u00a0a real performance comparison\u00a0(photographic test) with one of the most used Ritchey-Chretien telescope (produced by\u00a0Taiwanese GSO),\u00a0one of the optical designs\u00a0tested by Celestron during EdgeHD design but discarded because, as they reported, in order to obtain excellent resuIts, it would lead to a too high cost.<\/p>\n&nbsp;\n\n<figure id=\"attachment_973\" aria-describedby=\"caption-attachment-973\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-973 size-full\" src=\"https:\/\/www.primalucelab.com\/wp\/astronomy\/wp-content\/uploads\/sites\/4\/2017\/03\/Celetron_EdgeHD_articolo6.jpg\" alt=\"Celestron EdgeHD: EdgeHD 800 and GSO RC 8 during the test\" width=\"650\" height=\"449\" \/><figcaption id=\"caption-attachment-973\" class=\"wp-caption-text\">Celestron EdgeHD: EdgeHD 800 and GSO RC 8 during the test<\/figcaption><\/figure>\n\n&nbsp;\n<p style=\"text-align: justify;\">Analyzing the spot diagram we can see how the EdgeHD 800\u00a0focuses, at different distances (radius) from the optical center, the different wavelengths (red, green and blue) of star light. Celestron\u00a0EdgeHD 800 offers very well corrected stars even for a 14mm radius from the center corresponding to an image circle of 28mm, greater than APS-C sensors used by many DSLR cameras.<\/p>\n&nbsp;\n\n<figure id=\"attachment_1187\" aria-describedby=\"caption-attachment-1187\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1187 size-full\" src=\"https:\/\/www.primalucelab.com\/wp\/astronomia\/wp-content\/uploads\/sites\/3\/2017\/03\/Celetron_EdgeHD_articolo3.jpg\" alt=\"Celestron EdgeHD: EdgeHD 800 spot diagram\" width=\"650\" height=\"352\" \/><figcaption id=\"caption-attachment-1187\" class=\"wp-caption-text\">Celestron EdgeHD: EdgeHD 800 spot diagram<\/figcaption><\/figure>\n\n&nbsp;\n<p style=\"text-align: justify;\">Moreover, unlike other optical designs and telescopes from other brands, Celestron EdgeHD have dedicated focal reducers (4 elements for\u00a0EdgeHD 800 reducer, 5 elements\u00a0for EdgeHD 1100 and 1400 reducers) designed for both a wide corrected field and\u00a0a long\u00a0back focus (optimum distance between focal reducer and camera\u00a0sensor) that lets you insert also other\u00a0accessories (such as off-axis guiders, filter wheels or adaptive optics) between the camera\u00a0and focal reducer. In order to have\u00a0best performance, after removing the visual back and connecting\u00a0the Celestron EdgeHD 800 focal reducer directly to the rear thread in the back of the telescope, we must position the camera sensor at a distance of 105mm relative to the rear thread of the focal reducer.<\/p>\n&nbsp;\n\n<figure id=\"attachment_965\" aria-describedby=\"caption-attachment-965\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-965 size-full\" src=\"https:\/\/www.primalucelab.com\/wp\/astronomy\/wp-content\/uploads\/sites\/4\/2017\/03\/Celetron_EdgeHD_articolo4_EN.jpg\" alt=\"Celestron EdgeHD: scheme for use of 0,7x focal reducer with EdgeHD 800\" width=\"650\" height=\"425\" \/><figcaption id=\"caption-attachment-965\" class=\"wp-caption-text\">Celestron EdgeHD: scheme for use of 0,7x focal reducer with EdgeHD 800<\/figcaption><\/figure>\n\n&nbsp;\n<p style=\"text-align: justify;\">In order to\u00a0compare their performance we recorded\u00a0several test pictures comparing the EdgeHD 800 203mm f\/10 (with or without focal reducer) with the RC 8&#8243; GSO 200mm f\/8 (with and without flattener), all installed on the same mount\u00a0and imaging\u00a0with a Nikon D610 DSLR camera\u00a0with Full Frame\u00a0size sensor (36x24mm size, 43mm diagonal). The images (20 seconds exposition each @ 6400 ISO) below show also the magnification of an area of the sensor corresponding to the edge of a typical APS-C sized sensor\u00a0to highlight the field correction.<\/p>\n&nbsp;\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1214\" src=\"https:\/\/www.primalucelab.com\/wp\/astronomia\/wp-content\/uploads\/sites\/3\/2017\/03\/Celestron_EdgeHD_800_10.jpg\" alt=\"Celestron_EdgeHD_800_10\" width=\"650\" height=\"433\" \/><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1215\" src=\"https:\/\/www.primalucelab.com\/wp\/astronomia\/wp-content\/uploads\/sites\/3\/2017\/03\/Celestron_EdgeHD_800_riduttore_7.jpg\" alt=\"Celestron_EdgeHD_800_riduttore_7\" width=\"650\" height=\"433\" \/><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1216\" src=\"https:\/\/www.primalucelab.com\/wp\/astronomia\/wp-content\/uploads\/sites\/3\/2017\/03\/GSO_RC_8_no_spianatore.jpg\" alt=\"GSO_RC_8_no_spianatore\" width=\"650\" height=\"433\" \/><\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1217\" src=\"https:\/\/www.primalucelab.com\/wp\/astronomia\/wp-content\/uploads\/sites\/3\/2017\/03\/GSO_RC_8_spianatore.jpg\" alt=\"GSO_RC_8_spianatore\" width=\"650\" height=\"433\" \/><\/p>\n&nbsp;\n<p style=\"text-align: justify;\">As you can see from the images above, the performance of Celestron EdgeHD 800 are very similar compared to those of GSO RC 8 equipped with flattener, making both an excellent choice for those who want to perform deep-sky astrophotography. However, we noted few differences:<\/p>\n<p style=\"text-align: justify;\">&#8211; Celestron EdgeHD 800, thanks to the dedicated focal reducer, provides corrected images even at f\/7, and with much larger sensors. The focal reducer generates point stars and perfectly corrects APS-C sensor, but you can also use larger Full Frame sensors.<\/p>\n<p style=\"text-align: justify;\">&#8211; the GSO RC 8 generates the typical diffraction spikes, visible in the image as a cross around the star Capella. This is an\u00a0effect you\u00a0may like or not but you can not delete. The GSO also showed a field correction is not perfectly symmetrical, a sign that the focuser was not perfectly centered with the optical axis. This telescope is in fact much more difficult to collimate than the Celestron EdgeHD (that you can collimate\u00a0in a few minutes).<\/p>\n<p style=\"text-align: justify;\">Then we compared the performance of two telescopes in high resolution\u00a0planetary imaging using a QHYCCD 185C color camera and the same apochromatic 3xBarlow lens (by adjusting slightly image scale for the Barlow in order to\u00a0obtain the\u00a0same magnifications\u00a0in the two telescopes because of their different focal lengths). After noted that the mirror shift in the EdgeHD 800 was almost invisible, is really lower than classic Schmidt-Cassegrain telescopes, we\u00a0recorded two videos with the same number of images and we\u00a0processed in the same way with Registax and PixInsight (avoiding that processing could\u00a0modify results). We report the processing results in the below image: in the upper row the result of average 200 images (with Registax), in the row below with a slight processing (unsharp mask with PixInsight).\u00a0Note: unfortunately, the night had no a good seeing\u00a0and Jupiter was only 20 degrees on the horizon but the results are indicative of the performance of the two telescopes.<\/p>\n&nbsp;\n\n<figure id=\"attachment_982\" aria-describedby=\"caption-attachment-982\" style=\"width: 650px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-982 size-full\" src=\"https:\/\/www.primalucelab.com\/wp\/astronomy\/wp-content\/uploads\/sites\/4\/2017\/03\/Celetron_EdgeHD_articolo51.jpg\" alt=\"Celestron EdgeHD: Jupiter images with QHY5III185 color camera and comparison with GSO RC 8\" width=\"650\" height=\"650\" \/><figcaption id=\"caption-attachment-982\" class=\"wp-caption-text\">Celestron EdgeHD: Jupiter images with QHY5III185 color camera and comparison with GSO RC 8<\/figcaption><\/figure>\n\n&nbsp;\n<p style=\"text-align: justify;\">Here you can immediately see that\u00a0the Celestron EdgeHD 800, thanks to\u00a0lower obstruction, generates\u00a0much better images.\u00a0We note here that obstruction of the\u00a0EdgeHD 800 is\u00a034% while\u00a0the one of\u00a0GSO RC 8 is\u00a044%.<\/p>\n&nbsp;\n<h2>Conclusions:<\/h2>\n<p style=\"text-align: justify;\">EdgeHD 800 telescope proved to be a real high quality all-around\u00a0instrument that perfectly works both for long exposure astrophotography (great with the 0.7x focal reducer) and for high magnification planetary imaging. The EdgeHD is really a versatile telescope\u00a0we can recommend also to amateur astronomers that already have an apochromatic refractor (with lower focal length). The EdgeHD is in fact complementary to refractors and it excels precisely where apochromatic refractors (that are perfect for view field long-exposure astrophotography) show their limits: namely in long exposure imaging of smaller dimensions\u00a0deep-sky\u00a0objects and planetary\/lunar photography at high magnification, without disdain occasionally some nice observations!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Celestron EdgeHD telescopes are the evolution of classic Schmidt-Cassegrains: not only they can be used in visual (unlike the SC, they are perfect also\u00a0with very large\u00a0apparent field of view eyepieces) and for planetary and lunar photography but, thanks to dedicated focal reducers, they are great\u00a0instruments\u00a0for long-exposure astrophotography. In this article&#8230;<\/p>\n","protected":false},"author":2,"featured_media":2486,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[64],"tags":[],"class_list":["post-951","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astrophotography-technique"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v16.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Celestron EdgeHD: versatile telescope, many applications<\/title>\n<meta name=\"description\" content=\"Celestron EdgeHD telescopes are the evolution of classic SC: not only for visual and planetary\/lunar photography but also for deep-sky astrophotography.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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