Op het scherm van je camera is lastig te zien of een ster echt scherp is. Met dit Bahtinov masker voor een kleine telescoop zie je het wel: het masker maakt drie lichtspikes rond een heldere ster.<\/p>\n\n\n\n
Zet het masker voor de opening, richt op een heldere ster en draai aan de focuser tot de middelste spike precies tussen de andere twee staat. Het masker past op een tubus of dauwkap met een buitendiameter van 63 tot 139 mm, wat je vooral ziet bij kleine refractors en Maksutovs.<\/p>\n\n\n\n
Meet daarom de buitenkant van de voorzijde van je tubus of dauwkap, niet de opening van de lens. Haal het masker weg voor je gaat fotograferen. Meer tips voor je eerste opnames staan in onze gids over sterren fotograferen<\/a>.<\/p>\n\n\n\n Heb je een William Optics refractor van 102 of 103 mm, dan is er een masker speciaal voor die kijkers<\/a>. Is je tubus dikker, kijk dan naar het masker voor 139 tot 216 mm<\/a>.<\/p>","protected":false},"excerpt":{"rendered":" Focusmasker voor tubussen en dauwkappen met een buitendiameter van 63 tot 139 mm. Drie lichtspikes laten zien wanneer een ster precies scherp staat.<\/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-112833","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":34075,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-172-235mm-bahtinov-focusmasker\/","url_meta":{"origin":112833,"position":0},"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":34079,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-243-308mm-bahtinov-focusmasker\/","url_meta":{"origin":112833,"position":1},"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":7478,"url":"https:\/\/www.telescoop.nl\/en\/focus-masker-voor-seestar-s50\/","url_meta":{"origin":112833,"position":2},"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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