{"id":33881,"date":"2025-11-15T13:41:55","date_gmt":"2025-11-15T12:41:55","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=33881"},"modified":"2026-10-13T11:15:20","modified_gmt":"2026-10-13T09:15:20","slug":"william-optics-zenithstar-73-430-apo-gold-ota","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/william-optics-zenithstar-73-430-apo-gold-ota\/","title":{"rendered":"William Optics ZenithStar 73\/430 APO Gold OTA"},"content":{"rendered":"<h2 class=\"wp-block-heading has-text-align-center\"><strong>The happy medium for the star tracker<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <strong>William Optics ZenithStar 73 Gold<\/strong> is a lightweight, compact apochromat that fits perfectly on light mounts like a Star Adventurer or star tracker. Within minutes, you're ready to observe or photograph, at home or on the go.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" data-id=\"33884\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/William-Optics-AP-73-430-73-Apochromatische-refractor-Super-ZenithStar-Gold-OTA-4.jpg\" alt=\"William Optics ZenithStar 73 Gold Apochromatic Refractor, Full Frame\" class=\"wp-image-33884\" title=\"\"><\/figure>\n<\/figure>\n\n\n\n<h4 class=\"wp-block-heading\">Wide-angle view with edge-to-edge sharpness<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The 73 mm aperture with FPL-53 ED glass and 430 mm focal length (f\/5.9) provides a wide, color-pure field: star fields, larger nebulae, and the Milky Way fit comfortably in the frame. The included Bahtinov mask allows for precise focusing, and the handle with prism clamp directly attaches the guidescope or finder. With the optional Flat73A flattener, stars remain sharp even on full-frame, all the way to the corners.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>In the box<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ZenithStar 73\/430 Gold Optical Tube<\/li>\n\n\n\n<li>Tube Rings<\/li>\n\n\n\n<li>Vixen-Style dovetail<\/li>\n\n\n\n<li>Handle with prism clamp<\/li>\n\n\n\n<li>Bahtinov mask<\/li>\n\n\n\n<li>Soft carrier bag<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Featured accessories<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.telescoop.nl\/en\/telescope-accessories\/astro-photography\/other-astrophotography-accessories\/\">William Optics Flat73A flattener<\/a> (289 euro) is the appropriate field corrector for this tube; the UniGuide 32 mm guidescope (159 euro) enables guiding.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">For whom yes, for whom no<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Good for: Mobile astrophotographers who want a step up in aperture from the ZenithStar 61 while maintaining travel weight. Not for: Those who want to get the most out of a permanently set up full-frame setup; the ZenithStar 81 WIFD or the Cat 91 class would be better suited.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Specifications<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Optical design<\/td><td>Apochromat, FPL-53 doublet<\/td><\/tr><tr><td>Opening<\/td><td>73 mm<\/td><\/tr><tr><td>Focal length<\/td><td>430 millimeters<\/td><\/tr><tr><td>Opening ratio<\/td><td>f\/5,9<\/td><\/tr><tr><td>Focus assist<\/td><td>Bahtinov mask<\/td><\/tr><tr><td>Attachment<\/td><td>Mounts with Vixen-style dovetail and handle<\/td><\/tr><tr><td>Execution<\/td><td>OTA (empty tube), Gold<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Unsure about the right tube for your camera and mount? The <a href=\"https:\/\/www.telescoop.nl\/en\/telescope-selection-aid\/\">telescope selection aid<\/a> helps you choose. Also view all <a href=\"https:\/\/www.telescoop.nl\/en\/telescopes\/refracting-telescopes\/\">Refracting telescopes<\/a> and the full range of <a href=\"https:\/\/www.telescoop.nl\/en\/brands\/william-optics\/\">William Optics<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p><strong>This is just the tube (OTA), without mounting and tripod.<\/strong> You can choose the appropriate mounting and the accessories that come with it below.<\/p>\n<p>William Optics ZenithStar 73 Gold: FPL-53 Apochromatic 73\/430 f\/5.9 for Mobile Astrophotography. Supplied with tube rings, Vixen dovetail, handle with prism clamp, Bahtinov mask, and carrying case.<\/p>","protected":false},"featured_media":97373,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[643],"product_cat":[51,428,3175,567],"product_tag":[3352,3353],"class_list":["post-33881","product","type-product","status-publish","has-post-thumbnail","product_brand-william-optics","product_cat-telescopen","product_cat-telescopen-voor-astrofotografie","product_cat-refractor-ota","product_cat-refractor-telescopen","product_tag-sterrenkijker","product_tag-sterrenkijkers","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":[27281,90626,32949,31090,34300,34116,15860,33941,33946],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":33886,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-zenithstar-81-559-apo-wifd-goud-ota\/","url_meta":{"origin":33881,"position":0},"title":"William Optics ZenithStar 81\/559 APO WIFD Gold OTA","author":"","date":"15-11-2025","format":false,"excerpt":"This is the tube (OTA) only, without mounting and tripod. A suitable mounting and the accessories that come with it can be selected below. William Optics ZenithStar 81 WIFD Gold: FPL-53 achromatic 81\/559 f\/6.9 with internal focus. Supplied with tube rings, Arca\/Vixen dovetail, handle, Bahtinov mask, adapters and carrying case.","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-AP-81-559-81-Apochromatische-refractor-ZenithStar-WIFD-Goud-OTA-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33894,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-zenithstar-81-559-apo-wifd-red-ota\/","url_meta":{"origin":33881,"position":1},"title":"William Optics ZenithStar 81\/559 APO WIFD Red OTA","author":"","date":"15-11-2025","format":false,"excerpt":"This is just the tube (OTA), without mounting and tripod. A suitable mounting and the accessories that come with it can be selected below. William Optics ZenithStar 81 WIFD Red: FPL-53 achromatic 81\/559 f\/6.9 with internal focus, red version. Supplied with tube rings, Arca\/Vixen dovetail, handle, Bahtinov mask, adapters and carrying case.","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-AP-81-559-81-Apochromatische-refractor-ZenithStar-WIFD-Red-OTA-3.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":34116,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-71-73-zenithstar-transporttas\/","url_meta":{"origin":33881,"position":2},"title":"William Optics 71 &amp; 73 ZenithStar Transport Bag","author":"","date":"17-11-2025","format":false,"excerpt":"William Optics transport bag for the ZenithStar 71 or 73: sturdy nylon with zipper, made for the original foam insert of your telescope.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":33858,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-zenithstar-61-360-apo-ii-ota-2\/","url_meta":{"origin":33881,"position":3},"title":"William Optics ZenithStar 61\/360 APO II OTA","author":"Info telescoop","date":"15-11-2025","format":false,"excerpt":"This is just the tube (OTA), without mounting and tripod. A suitable mounting and the accessories that come with it can be selected below. William Optics ZenithStar 61 II, bare OTA: compact FPL-53 achromatic 61\/360 f\/5.9 for astrophotography and visual use. Supplied with tube rings, Arca\/Vixen dovetail and 2 to 1.25 inch adapter.","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-AP-61-360-ZS61-II-Apochromatische-refractor-ZenithStar-OTA-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":34300,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-flat73a-flattener-voor-zenithstar-73\/","url_meta":{"origin":33881,"position":4},"title":"William Optics Flat73A Flattener for ZenithStar 73","author":"","date":"17-11-2025","format":false,"excerpt":"William Optics Flat73A flattener for ZenithStar 73: M63 telescope side, M48 camera side, adjustable back focus with scale and direct M48 filter thread.","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-Flattener-Flat73A-voor-ZenithStar-73-5.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":33869,"url":"https:\/\/www.telescoop.nl\/en\/william-optics-zenithstar-61-360-apo-ii-ota\/","url_meta":{"origin":33881,"position":5},"title":"William Optics ZenithStar 61\/360 APO II OTA with Flattener and Guidescope","author":"","date":"15-11-2025","format":false,"excerpt":"This is just the tube (OTA), without the mounting and tripod. You can choose the appropriate mounting and the accessories that come with it below. William Optics ZenithStar 61 II set: FPL-53 achromatic 61\/360 f\/5.9 complete with field flattener, UniGuide 32 mm guide scope, tube rings, dovetail and carrying case. Ready to go straight for guided astrophotography.","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-AP-61-360-ZS61-II-Apochromatische-refractor-ZenithStar-OTA-3-1.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/33881","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=33881"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/97373"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=33881"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=33881"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=33881"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=33881"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}