{"id":34072,"date":"2025-11-16T15:31:28","date_gmt":"2025-11-16T14:31:28","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=34072"},"modified":"2026-03-20T10:40:32","modified_gmt":"2026-03-20T09:40:32","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":"

Always sharp, even at faint stars<\/strong><\/h3>\n\n\n\n

The William Optics 105-148mm focusing mask helps you focus quickly and accurately. It is made of high-quality acrylic glass with a light transmission of 92%. This keeps your image clear and sharp, even with faint stars.<\/p>\n\n\n\n

\n
\"William<\/figure>\n<\/figure>\n\n\n\n

Clearer bending pattern<\/strong><\/h3>\n\n\n\n

The imprint pattern of the mask is three times more pronounced than classic metal masks. This allows you to see the inflection more clearly and adjust the focus more quickly and precisely.<\/p>\n\n\n\n

Easy to use<\/strong><\/h3>\n\n\n\n

The mask fits telescopes from 105 to 148 mm in diameter. Simply place it over your telescope, and you're ready to focus. Thanks to the acrylic glass, you immediately notice the difference in clarity and contrast.<\/p>\n\n\n\n

\n
\"William<\/figure>\n<\/figure>\n\n\n\n

Specifications<\/strong><\/h3>\n\n\n\n

General<\/strong><\/h4>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Color<\/td>Transparent<\/td><\/tr>
Material<\/td>Acrylic<\/td><\/tr>
Diameter (mm)<\/td>105-148<\/td><\/tr>
Type<\/td>Mask<\/td><\/tr>
Design<\/td>Focus Mask<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"excerpt":{"rendered":"

William Optics 105-148mm Focus mask Bahtinov comes with adjustable mounting pins for telescopes from 105 to 148mm diameter. \u00a0<\/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":34082,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-75-110mm-bahtinov-mask\/","url_meta":{"origin":34072,"position":0},"title":"William Optics 75-110mm Bahtinov Mask","author":"","date":"16-11-2025","format":false,"excerpt":"William Optics 75-110mm Focus mask Bahtinov comes as a high quality focus mask made of optical acrylic glass with 92% light transmission, providing an approx. three times brighter diffraction image than classic metal masks. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"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":"","date":"16-11-2025","format":false,"excerpt":"William Optics 243-308mm comes as a high-quality focus mask made of optical acrylic glass with a light transmittance of 92%, providing an approx. three times brighter diffraction image than classic metal masks. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":34075,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-172-235mm-bahtinov-focusmasker\/","url_meta":{"origin":34072,"position":2},"title":"William Optics 172-235mm Bahtinov Focus Mask","author":"","date":"16-11-2025","format":false,"excerpt":"William Optics 172-235mm Focus mask Bahtinov comes with adjustable mounting pins for telescopes from 172 to 235mm diameter. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":33784,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-91-540-refractor-apo-space-gray-ota\/","url_meta":{"origin":34072,"position":3},"title":"William Optics 91\/540 Refractor APO Space Gray OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics AP 91\/540 comes with retractable dew cap, Bahtinov focus mask, Losmandy swallowtail, sturdy handle, 1:10 rack-and-pinion focuser and deluxe transport bag - ideal for sharp visual observation and astrophotography. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":33809,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-fluorostar-120-780-apo-space-gray-ota\/","url_meta":{"origin":34072,"position":4},"title":"William Optics Fluorostar 120\/780 APO Space Gray OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics 120\/780 comes with Bahtinov focus mask, Losmandy swallowtail, handle, Vixen\/Skywatcher accessory shoe and padded transport bag - premium triplet for crystal clear astrophotos and visual excellence. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":33751,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-fluorostar-132-925-refractor-apo-red-ota\/","url_meta":{"origin":34072,"position":5},"title":"William Optics Fluorostar 132\/925 Refractor APO Red OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics AP 132\/925 comes with Bahtinov focus mask, 3.7\" rotary focuser with 1:10 fine adjustment, Losmandy swallowtail, handle and padded transport bag - a top-of-the-line FPL-53 triplet for razor-sharp astrophotos and visual deep-sky observations. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/34072","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=34072"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/97501"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=34072"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=34072"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=34072"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=34072"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}