Komen sommige oculairs niet scherp omdat de uittrekbuis al helemaal uitgeschoven staat, dan kom je naar buiten scherpstelbereik tekort. Met deze focuserverhoging van 16,5 mm, ofwel circa 0,65 inch, van Starlight Instruments komt een 2 inch focuser verder van de tubus te staan.<\/p>\n\n\n\n
De verhoging (riser) komt tussen de focuserbasis en de focuser, zodat het hele scherpstelbereik naar buiten opschuift. Je hebt dit vaak nodig als je de originele focuser hebt vervangen door een focuser die lager bouwt. Meer losse delen vind je bij de telescope parts<\/a>.<\/p>\n\n\n\n Met ongeveer 16,5 mm is dit een kleine correctie, precies genoeg als je net een paar millimeter tekortkomt. Stel eerst scherp, meet hoeveel bereik je mist en kies de verhoging die daar net bij past. Ga niet hoger dan nodig, want je verliest evenveel bereik naar binnen.<\/p>\n\n\n\n Kom je meer tekort, dan is er de verhoging van circa 1 inch<\/a> or de verhoging van 1,4 inch<\/a>.<\/p>","protected":false},"excerpt":{"rendered":" Riser van Starlight Instruments die een 2 inch focuser zo’n 16,5 mm hoger zet, voor als je net een paar millimeter scherpstelbereik mist.<\/p>","protected":false},"featured_media":113415,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[3291],"product_cat":[56,3091],"product_tag":[],"class_list":["post-113416","product","type-product","status-publish","has-post-thumbnail","product_brand-starlight-instruments","product_cat-telescoop-accessoires","product_cat-telescoop-onderdelen","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":32467,"url":"https:\/\/www.telescoop.nl\/en\/bresser-verlengstuk-35mm-2-inch\/","url_meta":{"origin":113416,"position":0},"title":"Bresser extension piece 35mm 2 inch","author":"","date":"02-11-2025","format":false,"excerpt":"Bresser verlenghuls 35 mm voor 2 inch focusers: lost focusproblemen op bij oculairs, binoviewers en camera's. Lichtgewicht aluminium.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":107598,"url":"https:\/\/www.telescoop.nl\/en\/televue-verlengstuk-35-inch\/","url_meta":{"origin":113416,"position":1},"title":"TeleVue 3.5 inch Extension Tube","author":"Abdullah Ibrar","date":"28-04-2026","format":false,"excerpt":"A 2-inch extension of 3.5 inches that bridges the light path of a zenith mirror.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Verlengstuk 3,5 inch zwart cilindervormig verlengstuk met TeleVue-logo, messingkleurige binnenring en zijklem met duimschroef op een witte achtergrond.","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Verlengstuk-3-5-met-klemring-8-75cm-.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Verlengstuk-3-5-met-klemring-8-75cm-.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Verlengstuk-3-5-met-klemring-8-75cm-.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Verlengstuk-3-5-met-klemring-8-75cm-.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":107599,"url":"https:\/\/www.telescoop.nl\/en\/televue-verlengstuk-2-inch-50-mm\/","url_meta":{"origin":113416,"position":2},"title":"TeleVue 2-Inch 50mm Extension Tube","author":"Abdullah Ibrar","date":"28-04-2026","format":false,"excerpt":"2-inch extension of 50 mm for configurations that require additional light path.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"TeleVue Verlengstuk, 2\" zwart cilindervormig verlengstuk\/adaptersleeve met TeleVue-logo, messingkleurige binnenring en zijklem met duimschroef op een witte achtergrond.","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Verlengstuk-3-5-met-klemring-8-75cm-1-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Verlengstuk-3-5-met-klemring-8-75cm-1-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Verlengstuk-3-5-met-klemring-8-75cm-1-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/TeleVue-Verlengstuk-3-5-met-klemring-8-75cm-1-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":105717,"url":"https:\/\/www.telescoop.nl\/en\/levenhuk-ra-200n\/","url_meta":{"origin":113416,"position":3},"title":"Levenhuk Ra 200N \u2013 200\/1200 Dobson","author":"Info telescoop","date":"04-04-2026","format":false,"excerpt":"The Levenhuk Ra 200N Dobson comes with a 30mm Super View eyepiece, a 9mm Pl\u00f6ssl eyepiece, an 8x50 optical finder, a 2-inch Crayford focuser, and a built-in cooling fan.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Levenhuk Ra 200N Dobson Newtonian reflector with Dobsonian mount and optical finder on a white background","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2026\/04\/50748_levenhuk-ra-200n-dob_00_500_0372f041e54f24ea487454b2d4f8453a.webp?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":32457,"url":"https:\/\/www.telescoop.nl\/en\/bresser-verlengstuk-hexafoc-37-5mm-2-5-inch\/","url_meta":{"origin":113416,"position":4},"title":"Bresser extension Hexafoc 37.5mm 2.5 inch","author":"","date":"02-11-2025","format":false,"excerpt":"Bresser extension tube 37.5 mm with M68 threaded connection for the 2.5 inch Hexafoc focus lens. Rigid aluminum for visual use and astrophotography.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":94059,"url":"https:\/\/www.telescoop.nl\/en\/omegon-hybrid-crayford-focuser-newton-dual-speed-2\/","url_meta":{"origin":113416,"position":5},"title":"Omegon Hybrid Crayford Focuser Newton Dual Speed 2 inch","author":"","date":"13-01-2026","format":false,"excerpt":"Crayford focuser for Newtonian telescopes with a low profile of 48 mm, 1:11 dual-speed fine adjustment, extension drawtube, and 8 kg load capacity.","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-Focuser-Newton-Hybrid-Crayford-Dual-Speed-2-4.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/113416","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=113416"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/113415"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=113416"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=113416"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=113416"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=113416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}