{"id":112837,"date":"2026-10-09T16:52:29","date_gmt":"2026-10-09T14:52:29","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=112837"},"modified":"2026-10-09T20:31:24","modified_gmt":"2026-10-09T18:31:24","slug":"bahtinov-masker-voor-tubus-met-buitendiameter-368-tot-444-mm-astrozap","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/bahtinov-masker-voor-tubus-met-buitendiameter-368-tot-444-mm-astrozap\/","title":{"rendered":"Bahtinov mask for tubus with outer diameter 368 to 444 mm | Astrozap"},"content":{"rendered":"

Ook met een heel grote telescoop wil je zeker weten dat je scherp staat voordat je begint. Dit Bahtinov masker laat dat precies zien met drie lichtspikes rond een heldere ster.<\/p>\n\n\n\n

Je plaatst het masker voor de opening en draait aan de focuser tot de middelste spike netjes in het midden tussen de andere twee valt. Het past op een tubus of dauwkap met een buitendiameter van 368 tot 444 mm, een maat die je vooral ziet bij grote Dobson telescopes<\/a> en andere grote kijkers.<\/p>\n\n\n\n

Meet eerst de buitenkant van de voorzijde van je tubus, bij een vakwerk-Dobson de bovenring. Haal het masker weg zodra je scherp staat, want het blokkeert een deel van het licht en geeft spikes in je opname. Meer over het instellen van je telescoop lees je in adjust telescope<\/a>.<\/p>\n\n\n\n

Is je tubus iets dunner, dan past het masker voor 292 tot 368 mm<\/a> mogelijk beter.<\/p>","protected":false},"excerpt":{"rendered":"

Focusmasker voor zeer dikke tubussen en dauwkappen met een buitendiameter van 368 tot 444 mm. Voor precies scherpstellen op een heldere ster.<\/p>","protected":false},"featured_media":112829,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[3274],"product_cat":[3115,56],"product_tag":[],"class_list":["post-112837","product","type-product","status-publish","has-post-thumbnail","product_brand-astrozap","product_cat-focusing","product_cat-telescoop-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":34079,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-243-308mm-bahtinov-focusmasker\/","url_meta":{"origin":112837,"position":0},"title":"William Optics 243-308 mm Bahtinov Focus Mask","author":"Info telescoop","date":"16-11-2025","format":false,"excerpt":"William Optics Bahtinov Focusing Screen for tube diameters of 243\u2013308 mm: optical acrylic glass with 92% transmission and an extra-bright diffraction pattern for precise focusing.","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\/William-Optics-243-308mm-Focus-masker-Bahtinov-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":34075,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-172-235mm-bahtinov-focusmasker\/","url_meta":{"origin":112837,"position":1},"title":"William Optics 172-235mm Bahtinov Focus Mask","author":"","date":"16-11-2025","format":false,"excerpt":"William Optics Bahtinov Focusing Screen for tube diameters of 172\u2013235 mm: optical acrylic glass with 92% transmission and an extra-bright diffraction pattern for precise focusing.","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\/William-Optics-172-235mm-Focus-masker-Bahtinov-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":34072,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-105-148mm-bahtinov-focusmasker\/","url_meta":{"origin":112837,"position":2},"title":"William Optics 105-148mm Bahtinov Focus Mask","author":"","date":"16-11-2025","format":false,"excerpt":"William Optics Bahtinov Focusing Screen for tube diameters of 105\u2013148 mm: optical acrylic with 92% transmission and an extra-bright diffraction pattern for precise focusing.","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\/William-Optics-105-148mm-Focus-masker-Bahtinov-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":7478,"url":"https:\/\/www.telescoop.nl\/en\/focus-masker-voor-seestar-s50\/","url_meta":{"origin":112837,"position":3},"title":"Focus mask for Seestar S50","author":"","date":"12-02-2025","format":false,"excerpt":"Bahtinov focus mask for the ZWO Seestar S50, 3D printed from dimensionally stable PETG. 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