{"id":93288,"date":"2026-01-10T11:26:10","date_gmt":"2026-01-10T10:26:10","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=93288"},"modified":"2026-08-25T15:12:11","modified_gmt":"2026-08-25T13:12:11","slug":"omegon-dust-caps-304mm-ota-optical-tube","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/omegon-stofkappen-304mm-ota-optische-buis\/","title":{"rendered":"Omegon Dust Cap for 304 mm OTA (Optical Tube)"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>Omegon Dust Cover for 304 mm OTA (Optical Tube Assembly): closes the opening when the tube is not in use<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In a reflecting telescope, the primary mirror is at the bottom of the tube, with the opening as the only way out. Anything that enters through that opening will eventually hit the mirror. Dust can be blown away, but cleaning a mirror is work you'd rather not do, and it doesn't do the coating any favors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This cover seals the opening once you are finished observing. This keeps the inside of the tube clean and you need to touch the optics much less often.<\/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-Stofkappen-Stofkap-voor-12-OTA-2.jpg\" alt=\"Omegon 12-inch dust cover for optical tube opening\" title=\"\"><\/figure><figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Stofkappen-Stofkap-voor-12-OTA.jpg\" alt=\"Omegon 12-inch dust cover for optical tube opening\" title=\"\"><\/figure><figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Stofkappen-Stofkap-voor-12-OTA-1.jpg\" alt=\"Omegon 12-inch dust cover for optical tube opening\" title=\"\"><\/figure><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Features<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>Fits the opening of 12-inch pipes (304 mm)<\/li><li>Plastic version<\/li><li>Grip ribs on the side for hold with gloves<\/li><li>Equipped with ventilation openings<\/li><li>Slides over the tube and sits firmly in place<\/li><li>Suitable for storage and transport<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Compatibility<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Suitable for 12-inch tubes such as the Omegon Pro Astrograph 304\/1200, the Advanced X N 304\/1500 and the ProDob N 304\/1500 DOB II. When in doubt, measure the outer diameter of your tube, as it differs from the mirror's aperture: an 8-inch Newtonian typically has an outer diameter of around 235 mm.<\/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>Suitable for<\/strong><\/td><td>12-inch optical tubes<\/td><\/tr><tr><td><strong>Material<\/strong><\/td><td>Plastic<\/td><\/tr><tr><td><strong>Execution<\/strong><\/td><td>With grip ribs<\/td><\/tr><tr><td><strong>Type<\/strong><\/td><td>Transport and storage<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">You can find more maintenance articles for this merk on the <a href=\"\/en\/brands\/omegon\/\">Omegon merk Page<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Plastic dust cover for the opening of a 12-inch optical tube. With grip ridges on the side. Suitable for 12-inch tubes such as the Omegon Pro Astrograph 304\/1200, the Advanced X N 304\/1500, and the ProDob N 304\/1500 DOB II.<\/p>","protected":false},"featured_media":99466,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[126],"product_cat":[3150,56],"product_tag":[],"class_list":["post-93288","product","type-product","status-publish","has-post-thumbnail","product_brand-omegon","product_cat-schoonmaak-en-onderhoud","product_cat-telescoop-accessoires","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":[],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":16106,"url":"https:\/\/www.telescoop.nl\/en\/omegon-advanced-x-n-304-1500-dobson\/","url_meta":{"origin":93288,"position":0},"title":"Omegon Advanced X N 304\/1500 Dobson","author":"Info telescoop","date":"18-07-2025","format":false,"excerpt":"The Omegon Advanced X N 304\/1500 comes with a parabolic primary mirror (94% coating), a built-in mirror fan, a 2-inch Crayford focuser, a 25 mm Pl\u00f6ssl eyepiece, a 6x30 finder scope, and an accessory tray.","rel":"","context":"With 1 comment","block_context":{"text":"With 1 comment","link":"https:\/\/www.telescoop.nl\/en\/omegon-advanced-x-n-304-1500-dobson\/#comments"},"img":{"alt_text":"Omegon Dobson Teleskop Advanced X N 304\/1500","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Dobson-telescoop-Advanced-X-N-304-1500.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Dobson-telescoop-Advanced-X-N-304-1500.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Dobson-telescoop-Advanced-X-N-304-1500.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Dobson-telescoop-Advanced-X-N-304-1500.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Dobson-telescoop-Advanced-X-N-304-1500.jpg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/07\/Omegon-Dobson-telescoop-Advanced-X-N-304-1500.jpg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":92320,"url":"https:\/\/www.telescoop.nl\/en\/omegon-prodob-n-304-1500-dob-ii-luxe-zoeker\/","url_meta":{"origin":93288,"position":1},"title":"Omegon ProDob N 304\/1500 DOB II","author":"Info telescoop","date":"04-01-2026","format":false,"excerpt":"The Omegon ProDob N 304\/1500 DOB II comes with a Deluxe LED finder scope, 2-inch Crayford focuser, SWA 32mm eyepiece, primary mirror fan, and a wooden rocker box with a friction system.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Omegon ProDob N 304\/1500 DOB II Dobson-telescoop met luxe zoeker","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Dobson-telescoop-ProDob-N-304-1500-DOB-II-met-luxe-Zoeker-6.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":93322,"url":"https:\/\/www.telescoop.nl\/en\/omegon-hoofdspiegel-304mm-f5-spiegelset\/","url_meta":{"origin":93288,"position":2},"title":"Omegon Main Mirror 304 mm f\/5 Mirror Set","author":"","date":"10-01-2026","format":false,"excerpt":"Mirror set for self-building a 12-inch f\/5 Newtonian, with a 304 mm parabolic primary mirror and an elliptical secondary mirror with a 70 mm minor axis. 94 percent reflection coating.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Hoofdspiegels-12-F-5-spiegelset-5.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":92172,"url":"https:\/\/www.telescoop.nl\/en\/omegon-pro-newton-304-2432-lichtgewicht-truss-ota\/","url_meta":{"origin":93288,"position":3},"title":"Omegon Pro Newton 304\/2432 Lightweight Truss OTA","author":"","date":"03-01-2026","format":false,"excerpt":"The Omegon Pro RC 304\/2432 Lightweight Truss comes with an open carbon truss tube, hyperbolic quartz mirrors, a honeycomb primary mirror, a 3-inch monorail focuser, a fan, three extension tubes, and a Losmandy dovetail.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Omegon Pro RC 304\/2432 Ritchey-Chr\u00e9tien telescoop met lichtgewicht truss","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Ritchey-Chretien-Pro-RC-304-2432-lichtgewicht-truss-OTA-7.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":92182,"url":"https:\/\/www.telescoop.nl\/en\/omegon-pro-newton-304-2432-truss-ota\/","url_meta":{"origin":93288,"position":4},"title":"Omegon Pro Newton 304\/2432 Truss OTA","author":"","date":"03-01-2026","format":false,"excerpt":"The Omegon Pro RC 304\/2432 Truss comes with an open carbon truss tube, hyperbolic quartz mirrors, a 3-inch monorail focuser, fan, three extension tubes, an adjustable mirror cell, and a Losmandy dovetail.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Ritchey-Chretien-Pro-RC-304-2432-Truss-OTA-10.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":93279,"url":"https:\/\/www.telescoop.nl\/en\/omegon-stofkappen-203mm-ota-optische-buis\/","url_meta":{"origin":93288,"position":5},"title":"Omegon Dust cap for 203 mm OTA (Optical Tube)","author":"","date":"10-01-2026","format":false,"excerpt":"Plastic dust cover for the opening of an 8-inch optical tube. With grip ribs on the side. Suitable for 8-inch tubes from brands including Omegon, Sky-Watcher, and Vixen, including the Omegon Advanced X N 203\/1200.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/01\/Omegon-Stofkappen-Stofkap-voor-8-OTA-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\/93288","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=93288"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/99466"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=93288"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=93288"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=93288"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=93288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}