Bij een grote telescoop met een camera erachter kost een onscherpe nacht veel tijd. Met dit Bahtinov masker zie je precies wanneer je ster scherp is.<\/p>\n\n\n\n
Je zet het masker voor de opening en richt op een heldere ster. Het masker maakt drie lichtspikes zichtbaar. Staat de middelste spike precies tussen de andere twee in, dan is de focus goed en haal je het masker weg. Het past op een tubus of dauwkap met een buitendiameter van 292 tot 368 mm.<\/p>\n\n\n\n
Meet de buitenkant van de voorzijde van je tubus of dauwkap, zodat je zeker weet dat je in dit bereik zit. Stel scherp terwijl je naar het live beeld van je astrocamera<\/a> kijkt, met een korte belichtingstijd, dan zie je de spikes direct verschuiven.<\/p>\n\n\n\n Voor iets dunnere of dikkere tubussen zijn er het masker voor 216 tot 292 mm<\/a> and het masker voor 368 tot 444 mm<\/a>.<\/p>","protected":false},"excerpt":{"rendered":" Focusmasker voor dikke tubussen en dauwkappen met een buitendiameter van 292 tot 368 mm. Laat met drie spikes zien wanneer je ster precies scherp is.<\/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-112836","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":112836,"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":112836,"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":112836,"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":112836,"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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