{"id":1367,"date":"2025-11-13T13:00:59","date_gmt":"2025-11-13T12:00:59","guid":{"rendered":"https:\/\/www.primalucelab.com\/astronomy\/blog\/?p=1367"},"modified":"2025-11-14T13:23:23","modified_gmt":"2025-11-14T12:23:23","slug":"focusing-systems-for-telescopes-sistemi-di-messa-a-fuoco-per-telescopi","status":"publish","type":"ht_kb","link":"https:\/\/www.primalucelab.com\/blog\/support\/focusing-systems-for-telescopes-sistemi-di-messa-a-fuoco-per-telescopi\/","title":{"rendered":"Telescope focusers: choosing the best motorized solution between SESTO SENSO and ESATTO"},"content":{"rendered":"<p style=\"text-align: justify;\">High-quality telescope focusers are essential to achieve perfect focus, whether you use your telescope for astrophotography or visual observation. To help users upgrade their focusing performance, PrimaLuceLab developed two advanced motorized solutions: SESTO SENSO 3, our robotic focusing motor that enhances the telescope\u2019s existing focuser, and ESATTO, our complete robotic focuser that replaces the stock unit with a high-precision, high-load-capacity system. While both families share the same premium electronics and control ecosystem, they differ in mechanical design and capabilities \u2014 making each one ideal for specific telescopes and applications. In this article, you\u2019ll learn how the SESTO SENSO 3 and ESATTO compare, and how to choose the best motorized telescope focusers for your setup.<\/p>\n<p><!--more--><\/p>\n<p style=\"text-align: center;\"><iframe loading=\"lazy\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/F2DXfAOldHA?rel=0\" width=\"1000\" height=\"563\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\">\ufeff<\/span><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\">\ufeff<\/span><span data-mce-type=\"bookmark\" style=\"display: inline-block; width: 0px; overflow: hidden; line-height: 0;\" class=\"mce_SELRES_start\">\ufeff<\/span><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<h3><b>SESTO SENSO 3 and ESATTO: shared technologies<\/b><\/h3>\n<p style=\"text-align: justify;\">All SESTO SENSO 3 and ESATTO models share the same advanced PrimaLuceLab electronics and controls:<\/p>\n<ul>\n<li style=\"text-align: justify;\">USB-C port for direct connection to EAGLE or any external computer<\/li>\n<li style=\"text-align: justify;\">Wi-Fi connectivity for wireless control with the included Virtual HandPad<\/li>\n<li style=\"text-align: justify;\">Port for ARCO camera rotator and field de-rotator<\/li>\n<li style=\"text-align: justify;\">Temperature probe port for automated temperature-compensated focusing<\/li>\n<li style=\"text-align: justify;\">Dimmable status LEDs<\/li>\n<li style=\"text-align: justify;\">Full compatibility with PLAY astrophotography software and ASCOM drivers<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Both systems provide high focusing precision, and both support automatic and remote focusing. Where they differ is in their mechanical concept.<\/p>\n<figure id=\"attachment_7671\" aria-describedby=\"caption-attachment-7671\" style=\"width: 1000px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7671\" src=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image1.jpg\" alt=\"Telescope focusers: choosing the best motorized solution between SESTO SENSO and ESATTO\" width=\"1000\" height=\"525\" srcset=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image1.jpg 2000w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image1-300x158.jpg 300w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image1-1024x538.jpg 1024w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image1-768x403.jpg 768w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image1-50x26.jpg 50w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image1-1536x806.jpg 1536w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image1-60x32.jpg 60w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image1-100x53.jpg 100w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-7671\" class=\"wp-caption-text\"><em>Complete line of SESTO SENSO focusing motors and ESATTO telescope focusers<\/em><\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<h3><b>SESTO SENSO 3: a focusing motor for your external focuser<\/b><\/h3>\n<p style=\"text-align: justify;\">SESTO SENSO 3 is a telescope focusing motor designed to be installed on the fine focus shaft of your rack-and-pinion or Crayford-style focusers. This makes it the ideal solution when your telescope already includes a high-quality, smooth, dual-speed focuser.<\/p>\n<p><strong>When SESTO SENSO 3 is the best choice:<\/strong><br \/>\n\u2022 Refractors or Newtonians with quality Crayford or rack-and-pinion focusers<br \/>\n\u2022 Telescopes used both for visual and astrophotography<br \/>\n\u2022 Users who want a motorized solution that is non-invasive and affordable<\/p>\n<p><strong>Key advantages<\/strong><br \/>\n\u2022 Non-invasive installation \u2014 no need to replace the focuser<br \/>\n\u2022 Integrated encoder: while the motor is ON, you can move the focuser knob manually without losing calibration<br \/>\n\u2022 Perfect for switching quickly between eyepieces and cameras<br \/>\n\u2022 Light, compact, and cost-effective<\/p>\n<p><strong>Limitations<br \/>\n<\/strong>Since SESTO SENSO 3 controls the existing focuser, it cannot correct mechanical issues such as:<\/p>\n<p>\u2022 Backlash<br \/>\n\u2022 Flexure or limited load capacity<br \/>\n\u2022 Image shift caused by the primary mirror (in SCTs or similar designs)<\/p>\n<p style=\"text-align: justify;\">If your focuser has one of these limitations, upgrading to ESATTO is recommended.<\/p>\n<p>&nbsp;<\/p>\n<h3><b>SESTO SENSO 3 SC for Schmidt-Cassegrain and similar telescopes<\/b><\/h3>\n<p style=\"text-align: justify;\">For Schmidt-Cassegrain, ACF, EdgeHD, or Maksutov telescopes equipped with internal focuser, we developed the SESTO SENSO 3 SC \u2014 a dedicated version that connects directly to the telescope\u2019s focusing knob.<\/p>\n<p><b>Advantages of SESTO SENSO 3 SC:<br \/>\n<\/b>\u2022 Motorizes the native focuser<br \/>\n\u2022 Still allows <span class=\"s1\">manual focusing<\/span> when needed<br \/>\n\u2022 Non-invasive, quick to install<br \/>\n\u2022 Great for users who want a simple solution for visual and imaging without adding backfocus<\/p>\n<p class=\"p3\">However, like any motor that drives the original internal mechanism, it <span class=\"s2\">cannot eliminate mirror shift<\/span>. If mirror shift is a concern, ESATTO is the superior solution.<\/p>\n<p>&nbsp;<\/p>\n<figure id=\"attachment_7675\" aria-describedby=\"caption-attachment-7675\" style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7675\" src=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image2.jpg\" alt=\"Telescope focusers: choosing the best motorized solution between SESTO SENSO and ESATTO\" width=\"1000\" height=\"571\" srcset=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image2.jpg 2000w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image2-300x171.jpg 300w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image2-1024x584.jpg 1024w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image2-768x438.jpg 768w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image2-50x29.jpg 50w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image2-1536x876.jpg 1536w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image2-60x34.jpg 60w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image2-100x57.jpg 100w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-7675\" class=\"wp-caption-text\"><em>Refractor telescopes with SESTO SENSO 3 focusing motor (left) and ESATTO focuser (right)<\/em><\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<h3>ESATTO: a complete robotic focuser<\/h3>\n<p style=\"text-align: justify;\">ESATTO is a complete robotic focuser that replaces the original focuser (or is added to telescopes with internal focuser). It combines precision mechanics, high-load-capacity, motor, and control electronics in all in one compact, integrated unit. ESATTO is available in many versions:<\/p>\n<p>\u2022 ESATTO 2\u201d, 3\u201d, 4\u201d<br \/>\n\u2022 ESATTO 2\u201d LP, and ESATTO 3.5\u201d LP &#8211; Low Profile versions<\/p>\n<p><strong>When ESATTO is the best choice:<\/strong><br \/>\n\u2022 When your stock focuser has backlash, flexure, or limited load capacity<br \/>\n\u2022 When using heavy cameras, filter wheels, and accessories<br \/>\n\u2022 For demanding astrophotography setups<\/p>\n<p><strong>Advantages of ESATTO<\/strong><br \/>\n\u2022 Ultra-precise movement<br \/>\n\u2022 High load capacity (from 5kg to 10kg depending on the model)<br \/>\n\u2022 Larger free apertures also for full-frame or larger sensors<br \/>\n\u2022 Available in Low Profile versions for reducers \/ flatteners<\/p>\n<p style=\"text-align: justify;\">This is perfect for fine focusing and automated imaging. Being a complete robotic focuser, ESATTO is naturally less affordable than SESTO SENSO 3, and it also requires a dedicated adapter to be installed on each telescope model, since every telescope features a different mechanical interface. However, ESATTO provides higher performance compared to SESTO SENSO \u2014 with greater mechanical precision, higher load capacity, and improved rigidity \u2014 making it the ideal choice for demanding astrophotography setups.<\/p>\n<p>&nbsp;<\/p>\n<figure id=\"attachment_7673\" aria-describedby=\"caption-attachment-7673\" style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7673\" src=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image3.jpg\" alt=\"Telescope focusers: choosing the best motorized solution between SESTO SENSO and ESATTO\" width=\"1000\" height=\"582\" srcset=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image3.jpg 2000w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image3-300x174.jpg 300w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image3-1024x595.jpg 1024w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image3-768x447.jpg 768w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image3-50x29.jpg 50w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image3-1536x893.jpg 1536w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image3-60x35.jpg 60w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image3-100x58.jpg 100w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-7673\" class=\"wp-caption-text\"><em>SC-type telescopes with ESATTO focuser (left) and SESTO SENSO 3 SC focusing motor (right)<\/em><\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<h3>Which motorized telescope focuser should you choose?<\/h3>\n<p>Choose SESTO SENSO 3 if:<br \/>\n\u2022 Your refractor or Newtonian telescope already has a high-quality focuser<br \/>\n\u2022 You want a non-invasive, affordable motorized solution<br \/>\n\u2022 You use your telescope both visually and for imaging<\/p>\n<p>Choose SESTO SENSO 3 SC if:<br \/>\n\u2022 You have a Schmidt-Cassegrain or similar telescope<br \/>\n\u2022 You want a simple, non-invasive motorization<br \/>\n\u2022 Mirror shift is not a major concern<\/p>\n<p>Choose ESATTO if:<br \/>\n\u2022 Your current focuser has backlash, flexure, or limited load capacity<br \/>\n\u2022 You use heavy cameras and accessories and you need the highest performance for astrophotography<br \/>\n\u2022 You want to eliminate mirror shift on SCTs with mirror lock<\/p>\n<p>&nbsp;<\/p>\n<figure id=\"attachment_7681\" aria-describedby=\"caption-attachment-7681\" style=\"width: 1000px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-7681\" src=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image4.jpg\" alt=\"Telescope focusers: choosing the best motorized solution between SESTO SENSO and ESATTO\" width=\"1000\" height=\"513\" srcset=\"https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image4.jpg 2000w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image4-300x154.jpg 300w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image4-1024x525.jpg 1024w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image4-768x394.jpg 768w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image4-50x26.jpg 50w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image4-1536x788.jpg 1536w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image4-60x31.jpg 60w, https:\/\/www.primalucelab.com\/blog\/wp-content\/uploads\/2025\/11\/SESTO-SENSO-vs-ESATTO\u2013Which-motorized-focusing-system-is-right-for-your-telescope-image4-100x51.jpg 100w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-7681\" class=\"wp-caption-text\"><em>Newtonian telescopes with SESTO SENSO 3 focusing motor (left) and ESATTO focuser (right)<\/em><\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<h3>Conclusion<\/h3>\n<p style=\"text-align: justify;\">SESTO SENSO 3 and ESATTO are among the most advanced motorized telescope focusers available today, designed to greatly enhance the precision, stability, and control of your telescope\u2019s focusing system. The best choice depends on your telescope type, the mechanical quality of its existing focuser, and your observing or imaging goals. By selecting the right telescope focuser \u2014 SESTO SENSO 3 to upgrade a high-quality manual focuser, or ESATTO for maximum performance with a complete robotic focuser \u2014 you can unlock the full potential of your telescope. You\u2019ll achieve precise, repeatable, and even fully automated focusing: a key advantage for high-level astrophotography and an important improvement for visual observation as well.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>High-quality telescope focusers are essential to achieve perfect focus, whether you use your telescope for astrophotography or visual observation. To help users upgrade their focusing performance, PrimaLuceLab developed two advanced motorized solutions: SESTO SENSO 3, our robotic focusing motor that enhances the telescope\u2019s existing focuser, and ESATTO, our complete robotic&#8230;<\/p>\n","protected":false},"author":1,"featured_media":7671,"template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[42,43],"ht-kb-tag":[],"class_list":["post-1367","ht_kb","type-ht_kb","status-publish","format-standard","has-post-thumbnail","hentry","ht_kb_category-esatto-en","ht_kb_category-sesto-senso-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v16.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Telescope focusers: SESTO SENSO and ESATTO motorized solutions<\/title>\n<meta name=\"description\" content=\"Telescope focusers: discover the differences between SESTO SENSO 3 and ESATTO motorized focusing solutions for your telescope.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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