{"id":34161,"date":"2025-11-17T13:31:27","date_gmt":"2025-11-17T12:31:27","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=34161"},"modified":"2026-03-03T20:21:07","modified_gmt":"2026-03-03T19:21:07","slug":"william-optics-400mm-losmandy-swan-series-3","status":"publish","type":"product","link":"https:\/\/staging.telescoop.nl\/en\/william-optics-400mm-losmandy-swan-series-3\/","title":{"rendered":"William Optics 400mm Losmandy Swan Series"},"content":{"rendered":"

William Optics 400mm - Strong, stable base for your telescope<\/strong><\/h3>\n\n\n\n

The William Optics 400mm<\/strong> gives you a sturdy, reliable rail on which to safely secure your telescope or accessories. You slide it into the clamp, tighten it, and everything remains stable. This ensures a calm image even when you're focusing or adjusting your setup.<\/p>\n\n\n\n

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

Wide Losmandy rail for heavier equipment<\/strong><\/h3>\n\n\n\n

The 400mm Losmandy rail is wider than a standard Vixen rail. As a result, it carries heavier telescopes without bending. You immediately notice that your entire setup feels more stable. Your image stays quieter, and you can work more accurately more easily.<\/p>\n\n\n\n

More space for accessories<\/strong><\/h3>\n\n\n\n

You don't just use the rail for your telescope. It offers enough space to add additional tools, such as a tracking scope or a camera. So you build your ideal astrophoto setup, completely to your style. Everything stays firmly in place.<\/p>\n\n\n\n

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

Made for everyday use<\/strong><\/h3>\n\n\n\n

The rail is made of aluminum. Light, strong and dimensionally stable. You pick it up easily and it can take a beating. The gray finish gives it a neat, professional look and makes it easily visible among your other equipment.<\/p>\n\n\n\n

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

General<\/strong><\/h4>\n\n\n\n
Feature<\/th>Description<\/th><\/tr><\/thead>
Type<\/td>Dovetail<\/td><\/tr>
Design<\/td>Losmandy<\/td><\/tr>
Length (mm)<\/td>400<\/td><\/tr>
Weight (g)<\/td>1400<\/td><\/tr>
Material<\/td>Aluminum<\/td><\/tr>
Color<\/td>gray<\/td><\/tr><\/tbody><\/table><\/figure>","protected":false},"excerpt":{"rendered":"

William Optics 400mm comes with a gray 400mm Losmandy swallowtail plate in high-grade aluminum - suitable for heavy optics and attachment of accessories. \u00a0<\/p>","protected":false},"featured_media":97554,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[643],"product_cat":[56,3065,590,538],"product_tag":[],"class_list":["post-34161","product","type-product","status-publish","has-post-thumbnail","product_brand-william-optics","product_cat-telescoop-accessoires","product_cat-dovetails","product_cat-montering-accessoires","product_cat-monteringen","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":34133,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-400mm-losmandy-swan-series\/","url_meta":{"origin":34161,"position":0},"title":"William Optics 400mm Losmandy Swan Series","author":"","date":"17-11-2025","format":false,"excerpt":"William Optics 400mm comes as a 400mm long Losmandy-style Swan Series dovetail, made of red aluminum for stable mounting of telescopes and accessories. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-400mm-Losmandy-Swan-Series-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-400mm-Losmandy-Swan-Series-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-400mm-Losmandy-Swan-Series-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-400mm-Losmandy-Swan-Series-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":34147,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-400mm-losmandy-swan-series-2\/","url_meta":{"origin":34161,"position":1},"title":"William Optics 400mm Losmandy Swan Series","author":"","date":"17-11-2025","format":false,"excerpt":"William Optics 400mm comes with Losmandy-compatible dovetail of 400mm length in gold aluminum - ideal for heavy optical systems and accessories. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-400mm-Losmandy-Swan-Series-4.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-400mm-Losmandy-Swan-Series-4.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-400mm-Losmandy-Swan-Series-4.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-400mm-Losmandy-Swan-Series-4.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":33911,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-pleiades-181-998-apo-septuplet-astrograph-ota\/","url_meta":{"origin":34161,"position":2},"title":"William Optics Pleiades 181\/998 APO Septuplet Astrograph OTA","author":"","date":"15-11-2025","format":false,"excerpt":"William Optics 181 AP 181\/998 wordt geleverd met een ge\u00efntegreerde 7-elementen corrector, 3,7\" R&P focuser, Bahtinov masker, transporttas, Losmandy zwaluwstaart, handgreep en M48, M54 en M68 camera-adapters. \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u2026","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-181-AP-181-998-Apochromatische-refractor-Pleiades-Astrograph-OTA-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-181-AP-181-998-Apochromatische-refractor-Pleiades-Astrograph-OTA-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-181-AP-181-998-Apochromatische-refractor-Pleiades-Astrograph-OTA-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-181-AP-181-998-Apochromatische-refractor-Pleiades-Astrograph-OTA-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":33800,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-fluorostar-120-780-apo-red-ota\/","url_meta":{"origin":34161,"position":3},"title":"William Optics Fluorostar 120\/780 APO Red OTA","author":"","date":"14-11-2025","format":false,"excerpt":"William Optics 120\/780 comes with a Losmandy-style dovetail, handle, a special Bahtinov mask for perfect focusing, a Vixen\/Skywatcher accessory shoe and a soft transport bag for safe storage and transportation. \u00a0","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-120-780-Apochromatische-refractor-AP-Fluorostar-Red-OTA-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-120-780-Apochromatische-refractor-AP-Fluorostar-Red-OTA-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-120-780-Apochromatische-refractor-AP-Fluorostar-Red-OTA-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-120-780-Apochromatische-refractor-AP-Fluorostar-Red-OTA-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":34140,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-290mm-zwaluwstaart\/","url_meta":{"origin":34161,"position":4},"title":"William Optics 290mm Dovetail","author":"","date":"17-11-2025","format":false,"excerpt":"William Optics 290mm comes with multiple mounting options and slots for accessories - perfect for mounting on Vixen-style clamps.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-290mm-Zwaluwstaart-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-290mm-Zwaluwstaart-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-290mm-Zwaluwstaart-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-290mm-Zwaluwstaart-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":34168,"url":"https:\/\/staging.telescoop.nl\/en\/william-optics-vixen-style-zwaluwstaart-dovetail-7-inch\/","url_meta":{"origin":34161,"position":5},"title":"William Optics Vixen-Style Dovetail 7\u2033","author":"","date":"17-11-2025","format":false,"excerpt":"William Optics DSD 210 comes with dual Vixen- and Arca-Swiss-style dovetails, ideal for mounting accessories or telescope tubes.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-DSD-210-Zwaluwstaart-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-DSD-210-Zwaluwstaart-1.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-DSD-210-Zwaluwstaart-1.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/staging.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-DSD-210-Zwaluwstaart-1.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/34161","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/comments?post=34161"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/97554"}],"wp:attachment":[{"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=34161"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=34161"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=34161"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/staging.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=34161"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}