{"id":34072,"date":"2025-11-16T15:31:28","date_gmt":"2025-11-16T14:31:28","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=34072"},"modified":"2026-07-20T14:26:45","modified_gmt":"2026-07-20T12:26:45","slug":"william-optics-105-148mm-bahtinov-focus-mask","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-105-148mm-bahtinov-focusmasker\/","title":{"rendered":"William Optics 105-148mm Bahtinov Focus Mask"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>William Optics 105-148mm Bahtinov Focusmasker: scherpstellen zonder gokken<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The William Optics Bahtinov mask makes focusing on a star measurable. You place the mask in front of your telescope's aperture and point it at a bright star: the pattern will draw three spikes of light in your image. If the middle spike is exactly between the other two, the focus is perfect. No more guesswork, even with a camera.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dit masker is gesneden uit optisch acrylglas met 92% lichttransmissie en het patroon geeft ongeveer drie keer zoveel buiging als klassieke metalen maskers: de spiesen zijn helderder en dus ook op zwakkere sterren bruikbaar. Deze maat past op middelgrote refractors en kleine Newtons.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-3 is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\"><figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-105-148mm-Focus-masker-Bahtinov-1.jpg\" alt=\"William Optics Bahtinov focusmasker 105-148 mm\" title=\"\"><\/figure><figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-105-148mm-Focus-masker-Bahtinov-2.jpg\" alt=\"William Optics Bahtinov focusmasker 105-148 mm\" title=\"\"><\/figure><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Features<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>Past op buisdiameters van 105-148 mm dankzij verstelbare bevestigingspennen<\/li><li>Optical acrylic glass with 92% light transmission<\/li><li>About three times brighter diffraction pattern than metal masks<\/li><li>Indispensable for sharp astrophotos, also visually useful<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Compatibility<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Meet de buitendiameter van je buis of dauwkap: die moet tussen 105-148 mm liggen. Voor andere maten zijn er de overige uitvoeringen in de serie.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Specifications<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Type<\/strong><\/td><td>Bahtinov focus mask<\/td><\/tr><tr><td><strong>Tube diameter<\/strong><\/td><td>105-148 mm<\/td><\/tr><tr><td><strong>Material<\/strong><\/td><td>Optical acrylic glass, transparent<\/td><\/tr><tr><td><strong>Light transmission<\/strong><\/td><td>92%<\/td><\/tr><tr><td><strong>Attachment<\/strong><\/td><td>Adjustable pens<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">You can find more accessories for this merk at the <a href=\"\/en\/brands\/william-optics\/\">William Optics merk Page<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>William Optics Bahtinov focusmasker voor buisdiameters van 105-148 mm: optisch acrylglas met 92% transmissie en extra helder buigingspatroon voor exact scherpstellen.<\/p>","protected":false},"featured_media":97501,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[643],"product_cat":[3115,56],"product_tag":[],"class_list":["post-34072","product","type-product","status-publish","has-post-thumbnail","product_brand-william-optics","product_cat-focusing","product_cat-telescoop-accessoires","product_shipping_class-licht","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":34072,"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":34072,"position":1},"title":"William Optics 243-308 mm Bahtinov Focus Mask","author":"Info telescoop","date":"16-11-2025","format":false,"excerpt":"William Optics Bahtinov focusmasker voor buisdiameters van 243-308 mm: optisch acrylglas met 92% transmissie en extra helder buigingspatroon voor exact scherpstellen.","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":34082,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-75-110mm-bahtinov-mask\/","url_meta":{"origin":34072,"position":2},"title":"William Optics 75-110mm Bahtinov Mask","author":"","date":"16-11-2025","format":false,"excerpt":"William Optics Bahtinov focusmasker voor buisdiameters van 75-110 mm: optisch acrylglas met 92% transmissie en extra helder buigingspatroon voor exact scherpstellen.","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-75-110mm-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":34072,"position":3},"title":"Focus mask for Seestar S50","author":"","date":"12-02-2025","format":false,"excerpt":"Bahtinov-focusmasker voor de ZWO Seestar S50, 3D-geprint van vormvast PETG. 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