Bij zelfbouw ligt het scherpstelpunt soms ver buiten de tubus, verder dan je uittrekbuis kan overbruggen. Deze focuserverhoging van 69,9 mm, circa 2,75 inch, van Starlight Instruments zet een 2 inch focuser zo’n 7 cm verder van de tubus.<\/p>\n\n\n\n
De verhoging komt tussen de focuserbasis en de focuser, zodat het hele scherpstelbereik naar buiten opschuift. Dat is steviger dan een verlengbus in de uittrekbuis, omdat de uittrekbuis zelf niet verder uit hoeft te schuiven.<\/p>\n\n\n\n
Meet vooraf goed hoeveel extra bereik je nodig hebt, want je verliest evenveel bereik naar binnen. Bij een Newton telescope<\/a> geldt bovendien: hoe verder de focuser van de tubus staat, hoe groter de vangspiegel moet zijn om het beeldveld volledig te belichten.<\/p>\n\n\n\n Kom je minder tekort, dan is de verhoging van 1,4 inch<\/a> genoeg. Voor nog meer hoogte is er de verhoging van circa 3,75 inch<\/a>.<\/p>","protected":false},"excerpt":{"rendered":" Riser van Starlight Instruments die een 2 inch focuser circa 2,75 inch hoger zet, vooral voor opstellingen met een scherpstelpunt ver buiten de tubus.<\/p>","protected":false},"featured_media":113421,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[3291],"product_cat":[56,3091],"product_tag":[],"class_list":["post-113422","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":92182,"url":"https:\/\/www.telescoop.nl\/en\/omegon-pro-newton-304-2432-truss-ota\/","url_meta":{"origin":113422,"position":0},"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":92206,"url":"https:\/\/www.telescoop.nl\/en\/omegon-pro-rc-355-2845-ota\/","url_meta":{"origin":113422,"position":1},"title":"Omegon Pro RC 355\/2845 - Ritchey-Chretien Truss OTA","author":"Info telescoop","date":"03-01-2026","format":false,"excerpt":"The Omegon Pro RC 355\/2845 Truss comes with an open carbon truss tube, hyperbolic quartz mirrors with honeycomb structure, 3 inch monorail focuser, powerful fans, extension tubes 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-355-2845-Truss-OTA-5.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":25767,"url":"https:\/\/www.telescoop.nl\/en\/omegon-verlengstuk-125-inch-30-mm\/","url_meta":{"origin":113422,"position":2},"title":"Omegon 1.25 inch 30mm Extension Tube","author":"","date":"25-08-2025","format":false,"excerpt":"1.25 inch extension with 30 mm length and side set screw. 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