{"id":33267,"date":"2025-11-10T13:53:15","date_gmt":"2025-11-10T12:53:15","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=33267"},"modified":"2026-08-25T15:11:25","modified_gmt":"2026-08-25T13:11:25","slug":"ioptron-iafs3-2-inch-automatic-focuser","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/ioptron-iafs3-2-inch-automatic-focuser\/","title":{"rendered":"iOptron iAFS3 2\u2033 Automatic Focuser"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>iOptron iAFS3 2\u2033 Automatic Focuser: inline 3-inch automatic focuser<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The iAFS3 is the 3-inch version of iOptron's inline automatic focuser. It sits in the optical path between the telescope and camera; the worm gear drive provides zero backlash and passively locks the position (iLock), so the focus remains stable at any tube position.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">With a 6 kg payload capacity and a clear aperture of 68 mm, the iAFS3 is made for large RCs, astrographs, and full-frame imaging trains without vignetting. The resolution is 0.6 \u00b5m per step.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-iAFS3-2-Automatic-Focuser-1.jpg\" alt=\"iOptron iAFS3 2\" automatic title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-iAFS3-2-Automatic-Focuser-2.jpg\" alt=\"iOptron iAFS3 2\" automatic title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-iAFS3-2-Automatic-Focuser-3.jpg\" alt=\"iOptron iAFS3 2\" automatic title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-iAFS3-2-Automatic-Focuser-4.jpg\" alt=\"iOptron iAFS3 2\" automatic title=\"\"><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-iAFS3-2-Automatic-Focuser-5.jpg\" alt=\"iOptron iAFS3 2\" automatic title=\"\"><\/figure>\n<\/figure>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8d39b2df wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:38%\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-iAFS3-2-Automatic-Focuser-2.jpg\" alt=\"iOptron iAFS3 2\" automatic title=\"\"><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:62%\">\n<h4 class=\"wp-block-heading\"><strong>Three ways of focusing<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Operation can be via computer (ASCOM and INDI), with buttons on the housing, or with the manual focus wheel that overrides the motor. The built-in temperature sensor feeds temperature compensation into your imaging software, keeping focus sharp all night.<\/p>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8d39b2df wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:38%\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-iAFS3-2-Automatic-Focuser-3.jpg\" alt=\"iOptron iAFS3 2\" automatic title=\"\"><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:62%\">\n<h4 class=\"wp-block-heading\"><strong>Supplied complete<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The iAFS3 comes with a 2-inch visual back and USB-C cables, and remembers its position without power. The camera angle adjuster rotates your framing without detaching the optical train. iAFS3 adapters are available for the telescope side, including for GSO 3-inch Newtonians, GSO RC10 to RC16, and Askar APOs.<\/p>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Included<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>iAFS3 focuser (FA30)<\/li>\n\n\n\n<li>2\u2033 visual back<\/li>\n\n\n\n<li>USB-C cables<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Featured accessories<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Choose the iAFS3 adapter that matches your telescope, for example for GSO 10\u2033 and 12\u2033 Newtonians.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>For whom yes and for whom no<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u2713 Astrophotographers with large RCs, astrographs, or full-frame imaging trains up to 6 kg<\/li>\n\n\n\n<li>\u2717 Compact tubes and lighter trains: the more affordable iAFS2 is sufficient for that<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Specifications<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Type<\/strong><\/td><td>Inline autofocus, 3 inch<\/td><\/tr><tr><td><strong>Resolution<\/strong><\/td><td>0.6 \u00b5m per step, zero backlash<\/td><\/tr><tr><td><strong>Carrying capacity<\/strong><\/td><td>6 kg<\/td><\/tr><tr><td><strong>Free opening<\/strong><\/td><td>68 mm<\/td><\/tr><tr><td><strong>Slag<\/strong><\/td><td>30 mm<\/td><\/tr><tr><td><strong>Weight<\/strong><\/td><td>1,062 g<\/td><\/tr><tr><td><strong>Connection<\/strong><\/td><td>2x USB-C (USB 2.0), ASCOM and INDI<\/td><\/tr><tr><td><strong>Additional<\/strong><\/td><td>Temperature sensor, camera angle adjuster, position memory, iLock<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">You can find more mounts and accessories for this merk at the <a href=\"https:\/\/www.telescoop.nl\/en\/brands\/ioptron\/\">iOptron merk page<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>iOptron iAFS3 3\u2033 automatic focuser with iLock, 0.6 \u00b5m resolution, 6 kg payload capacity, 68 mm clear aperture, and dual USB-C, including 2\u2033 visual back.<\/p>","protected":false},"featured_media":97130,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[2790],"product_cat":[56,3114,593,500],"product_tag":[],"class_list":["post-33267","product","type-product","status-publish","has-post-thumbnail","product_brand-ioptron","product_cat-telescoop-accessoires","product_cat-electronic-focusers","product_cat-focus-navigatie","product_cat-focusers","product_shipping_class-licht","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"bundled_by":[],"bundle_stock_status":"instock","bundle_stock_quantity":null,"bundle_virtual":false,"bundle_layout":"","bundle_add_to_cart_form_location":"","bundle_editable_in_cart":false,"bundle_sold_individually_context":"","bundle_item_grouping":"","bundle_min_size":"","bundle_max_size":"","bundle_price":[],"bundled_items":[],"bundle_sell_ids":[33307],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":33266,"url":"https:\/\/www.telescoop.nl\/en\/ioptron-iafs2-2-inch-automatic-focuser\/","url_meta":{"origin":33267,"position":0},"title":"iOptron iAFS2 2\u2033 Automatic Focuser","author":"","date":"10-11-2025","format":false,"excerpt":"iOptron iAFS2 2\" Automatic Focuser with iLock, 0.6 \u00b5m resolution, 5 kg payload capacity, temperature sensor, camera angle adjuster, and dual USB-C, includes 2\" visual back.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-iAFS2-2-Automatic-Focuser-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33307,"url":"https:\/\/www.telescoop.nl\/en\/ioptron-adapter-iafs3-gso-newton-3\/","url_meta":{"origin":33267,"position":1},"title":"iOptron Adapter iAFS3 \/ GSO Newton 3\u2033","author":"","date":"10-11-2025","format":false,"excerpt":"iOptron iAFS3 aluminum adapter for mounting the iAFS3 on GSO 10\" and 12\" Newtonians with 3\" focuser connection.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-Adapter-iAFS3-GSO-Newton-3-2-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33308,"url":"https:\/\/www.telescoop.nl\/en\/ioptron-iafs3-m106-adapter\/","url_meta":{"origin":33267,"position":2},"title":"iOptron iAFS3 \/ M106 Adapter","author":"","date":"10-11-2025","format":false,"excerpt":"iOptron iAFS3 aluminum adapter for mounting the iAFS3 on telescopes with an M106x1 thread, such as the Askar 103 and 120 APO.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-iAFS3-M106-Adapter-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33309,"url":"https:\/\/www.telescoop.nl\/en\/ioptron-iafs3-m117-adapter\/","url_meta":{"origin":33267,"position":3},"title":"iOptron iAFS3 \/ M117 Adapter","author":"","date":"10-11-2025","format":false,"excerpt":"iOptron iAFS3-adapter van aluminium voor montage van de iAFS3 op telescopen met M117x1 schroefdraad, zoals de GSO RC10, RC12, RC14 en RC16.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-iAFS3-M117-Adapter-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33310,"url":"https:\/\/www.telescoop.nl\/en\/ioptron-ieaf-electronic-automatic-focuser\/","url_meta":{"origin":33267,"position":4},"title":"iOptron iEAF Electronic Automatic Focuser","author":"","date":"10-11-2025","format":false,"excerpt":"iOptron iEAF electronic stepper motor focuser with temperature sensor, mounting plate, USB cables and mounting hardware, for automatic focusing via ASCOM.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-iEAF-Electronic-Automatic-Focuser-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":32661,"url":"https:\/\/www.telescoop.nl\/en\/ioptron-m74-m68-adapter\/","url_meta":{"origin":33267,"position":5},"title":"iOptron M74 \/ M68 Adapter","author":"","date":"06-11-2025","format":false,"excerpt":"iOptron M74\/M68 adapter van aluminium: van M74x0,75 (telescoopzijde) naar M68x1 (camerazijde), voor het iAFS3-focussysteem.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/iOptron-M74-M68-Adapter-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/33267","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=33267"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/97130"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=33267"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=33267"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=33267"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=33267"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}