{"id":93172,"date":"2026-01-09T14:44:24","date_gmt":"2026-01-09T13:44:24","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=93172"},"modified":"2026-09-04T14:04:58","modified_gmt":"2026-09-04T12:04:58","slug":"omegon-step-down-ring-109mm-78mm","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/omegon-step-down-ring-109mm-78mm\/","title":{"rendered":"Omegon Step-Down Ring 109 mm to 78 mm"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>Omegon Step-Down Ring 109 mm to 78 mm: large tube opening, standard focus ring<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Some Newton tubes have a focal opening with a 109 mm ring clamp, while the Omegon focusers connect to 78 mm. This ring bridges that difference in a single part: 109 mm on the tube side, 78 mm on the focus side.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The free passage of 75 mm remains ample, so that the beam of fast Newtons is not squeezed. The optical length of 2 mm is negligible.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-3 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Stapsgewijze-ring-109-tot-78-mm-1.jpg\" alt=\"Omegon step-down ring from 109 mm to 78 mm ring clamp\" title=\"\"><\/figure><figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Stapsgewijze-ring-109-tot-78-mm.jpg\" alt=\"Omegon step-down ring from 109 mm to 78 mm ring clamp\" title=\"\"><\/figure><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Features<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>Tube-side ring clamp 109 mm<\/li><li>Focusing side 78 mm<\/li><li>Free passage 75 mm<\/li><li>Optical length 2 mm<\/li><li>Anodized aluminum<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Compatibility<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For Newton tubes with 109 mm ring clamp and focal lengths with 78 mm connection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Specifications<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Side of the tube<\/strong><\/td><td>Ring terminal 109 mm<\/td><\/tr><tr><td><strong>Focuser side<\/strong><\/td><td>78 mm<\/td><\/tr><tr><td><strong>Free passage<\/strong><\/td><td>75 mm<\/td><\/tr><tr><td><strong>Optical length<\/strong><\/td><td>2 mm<\/td><\/tr><tr><td><strong>Width<\/strong><\/td><td>114 mm<\/td><\/tr><tr><td><strong>Material<\/strong><\/td><td>Anodized aluminum<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">You can find more adapters for this brand on the <a href=\"\/en\/brands\/omegon\/\">Omegon brand page<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Step-down ring that connects Newton tubes with a 109 mm ring clamp to focusers with a 78 mm connection. Free passage 75 mm.<\/p>","protected":false},"featured_media":99379,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[126],"product_cat":[56,499,469,3104],"product_tag":[],"class_list":["post-93172","product","type-product","status-publish","has-post-thumbnail","product_brand-omegon","product_cat-telescoop-accessoires","product_cat-adapters","product_cat-astro-fotografie","product_cat-overige-astrofotografie-accessoires","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":[],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":93146,"url":"https:\/\/www.telescoop.nl\/en\/omegon-adapterbundel-80mm-78mm-adapterplaat\/","url_meta":{"origin":93172,"position":0},"title":"Omegon 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