Bij astrofotografie scheelt goed scherpstellen veel mislukte opnames, maar op een scherm zie je moeilijk of een ster echt scherp is. Dit Bahtinov masker maakt dat zichtbaar met drie lichtspikes.<\/p>\n\n\n\n
Het masker past op een tubus of dauwkap met een buitendiameter van 139 tot 216 mm. Zet het voor de opening, richt op een heldere ster en draai rustig aan de focuser tot de middelste van de drie spikes precies tussen de andere twee in valt. Haal het masker daarna weg.<\/p>\n\n\n\n
Meet de buitenkant van de voorzijde van je tubus of dauwkap, niet de opening van de spiegel of lens. Bij lichtsterke telescopes for astrophotography<\/a> is precies scherpstellen extra belangrijk, omdat het scherptebereik daar klein is.<\/p>\n\n\n\n Voor dunnere en dikkere tubussen zijn er het masker voor 63 tot 139 mm<\/a> and het masker voor 216 tot 292 mm<\/a>.<\/p>","protected":false},"excerpt":{"rendered":" Focusmasker voor tubussen en dauwkappen met een buitendiameter van 139 tot 216 mm. Zo zie je precies wanneer een ster scherp staat, ook op een klein scherm.<\/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-112834","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":112834,"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":112834,"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":112834,"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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