{"id":57207,"date":"2026-01-28T11:33:02","date_gmt":"2026-01-28T10:33:02","guid":{"rendered":"https:\/\/www.ganymedes.nl\/?post_type=product&#038;p=57207"},"modified":"2026-02-27T16:19:07","modified_gmt":"2026-02-27T15:19:07","slug":"william-optics-ultracat-56-refractor-telescoop","status":"publish","type":"product","link":"https:\/\/dev4-ganymedes.nl\/en\/product\/william-optics-ultracat-56-refractor-telescoop\/","title":{"rendered":"William Optics UltraCat 56 refractor telescoop"},"content":{"rendered":"<h2>De nieuwste Cat in de Ultra series van William Optics, De Ultra-Cat 56<\/h2>\n<p>De Ultra-Cat 56 is een hoogwaardige 56 mm apochromatische refractor, ontworpen voor astrofotografen die uitzonderlijke draagbaarheid eisen zonder in te boeten aan optische precisie, kleurnauwkeurigheid en breedbeeldprestaties.<\/p>\n<p>Met een geavanceerd Petzval-optisch ontwerp met 5 elementen, super ED- en lanthaan-glas, in combinatie met een snelle f\/4,8-brandpuntsafstand, levert de Ultra-Cat 56 haarscherpe, perfect vlakke beelden over een beeldcirkel van 50 mm. Met een brandpuntsafstand van 269 mm is hij geoptimaliseerd voor Full Frame-, APS-C- en M4\/3-sensoren en blijft hij volledig compatibel met middenformaatcamera&#8217;s, waardoor hij een ideaal ultrabreedbeeldplatform is voor deep-sky- en grootschalige nevelfotografie.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-57210 size-vp_sm\" title=\"William Optics Ultra-Cat 56\" src=\"https:\/\/www.ganymedes.nl\/wp-content\/uploads\/2026\/01\/UC56-pers-2-500x500.webp\" alt=\"William Optics Ultra-Cat 56\" width=\"500\" height=\"500\" srcset=\"https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/UC56-pers-2-500x500.webp 500w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/UC56-pers-2-324x324.webp 324w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/UC56-pers-2-100x100.webp 100w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/UC56-pers-2-416x416.webp 416w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/UC56-pers-2-300x300.webp 300w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/UC56-pers-2-768x768.webp 768w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/UC56-pers-2-132x132.webp 132w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/UC56-pers-2-800x800.webp 800w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/UC56-pers-2.webp 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h3>Belangrijkste kenmerken:<\/h3>\n<ul>\n<li>Geavanceerde 5-element Petzval-optica<\/li>\n<li>Elimineert veldkromming en zorgt voor scherpe sterren van rand tot rand zonder extra vlakmakers.<\/li>\n<li>Grote beeldcirkel van 50 mm<\/li>\n<li>Ondersteunt volledig full-frame camera&#8217;s, APS-C- en M4\/3-sensoren voor optimale prestaties. Compatibel met middenformaat.<\/li>\n<li>Snelle f\/4.8-optiek<\/li>\n<li>Superieure lichtopbrengst, waardoor deep-sky-opnames met kortere belichtingstijden mogelijk zijn.<\/li>\n<li>WIFD (William Optics Internal Focuser Design)<\/li>\n<li>Gepatenteerde interne tandheugel- en rondsel-focusseerinrichting zorgt voor stabiele en nauwkeurige scherpstelling.<\/li>\n<li>Geen vignettering of balansproblemen \u2014 ideaal voor astrofotografie.<\/li>\n<li>Compatibel met EAF (Electronic Automatic Focuser) voor nauwkeurige focusregeling.<\/li>\n<li>Sensor Tilt Xterminator (STX) &amp; Rotator<\/li>\n<li>Ge\u00efntegreerde kantelversteller elimineert sensorafwijkingen en zorgt voor een uniforme beeldscherpte.<\/li>\n<li>Geen flattener nodig<\/li>\n<li>Het optische ontwerp corrigeert op natuurlijke wijze veldkromming, wat de installatie vereenvoudigt.<\/li>\n<li>Anti-krimp lensceltechnologie<\/li>\n<li>Vermindert thermische uitzettingseffecten en zorgt voor een perfecte optische uitlijning in elk klimaat.<\/li>\n<li>Gepatenteerd Bahtinov-masker voor scherpstelling<\/li>\n<li>Ingebouwde scherpstelhulp zorgt voor een nauwkeurige scherpte van sterren.<\/li>\n<li>Hoogwaardige constructie en ergonomisch ontwerp<\/li>\n<li>Lichtgewicht maar robuuste (4,31 kg) constructie met een strakke geanodiseerde afwerking.<\/li>\n<li>Gepatenteerd handvatontwerp voor verbeterde draagbaarheid en gebruiksgemak.<\/li>\n<li>Veelzijdige cameracompatibiliteit<\/li>\n<li>Ondersteunt Canon EF-, RF-, Nikon F-, Z-, Sony E-, Pentax K-, MFT- en FUJI X-vattingen.<\/li>\n<\/ul>\n<h3 data-start=\"2261\" data-end=\"2444\">Wat krijg je er bij?<\/h3>\n<ul>\n<li>De UltraCat 56 OTA<\/li>\n<li>Bahtinov masker<\/li>\n<li>Adapters voor M48, M54 en M68<\/li>\n<li>Vixen Style mounting plate<\/li>\n<li>Buis ringen met handle bar<\/li>\n<li>Opbergtas<\/li>\n<li>Inbussleutel set<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignleft wp-image-57213 size-vp_md\" title=\"William Optics Ultra-Cat 56 box content\" src=\"https:\/\/www.ganymedes.nl\/wp-content\/uploads\/2026\/01\/box-content-ultracat-56-800x150.png\" alt=\"William Optics Ultra-Cat 56 box content\" width=\"800\" height=\"150\" srcset=\"https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/box-content-ultracat-56-800x150.png 800w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/box-content-ultracat-56-324x61.png 324w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/box-content-ultracat-56-416x78.png 416w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/box-content-ultracat-56-300x56.png 300w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/box-content-ultracat-56-1030x194.png 1030w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/box-content-ultracat-56-768x144.png 768w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/box-content-ultracat-56-140x26.png 140w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/box-content-ultracat-56-500x94.png 500w, https:\/\/dev4-ganymedes.nl\/wp-content\/uploads\/2026\/01\/box-content-ultracat-56.png 1208w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<h4>Plaats je bestelling online of kom langs in de winkel<\/h4>\n<p>Heb je gevonden wat je zoekt en wil je bijvoorbeeld de William Optics UltraCat 56 telescoop bestellen? Dan doe je dit heel eenvoudig online. Bekijk je deze producten liever in het echt voordat je ze koopt? Ook dat is bij ons mogelijk. Je bent van harte welkom in onze showroom in Amstelveen van maandag tot vrijdag tussen 10.00 en 17.00 uur. Op zaterdag is de showroom ook geopend, maar dan van 10.00 tot 16.30 uur. Voor meer informatie en advies kun je ook telefonisch contact met ons opnemen via <a href=\"tel:0031206412083\">020-6412083<\/a>. We helpen je graag.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>De William Optics Ultracat 56 is een snelle f\/4.8 Petzval-refractor met 56 mm opening, ontworpen voor full-frame en medium format astrofotografie. Vlak beeldveld, geen flattener nodig.<\/p>\n","protected":false},"featured_media":57212,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_vp_format_video_url":"","_vp_image_focal_point":[],"_vp_custom_popup_image":0,"_vp_format_audio_url":"","_vp_custom_thumbnail":0,"_vp_custom_thumbnail_focal_point":[],"_vp_hover_thumbnail":0,"_vp_hover_thumbnail_focal_point":[]},"product_brand":[],"product_cat":[38,27,204,117,23,121],"product_tag":[],"class_list":{"0":"post-57207","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-telescopen-refractor-astrofotografie","7":"product_cat-telescopen-astrofotografie-telescopen","8":"product_cat-merken-william-optics-cat-series","9":"product_cat-merken","10":"product_cat-telescopen","11":"product_cat-merken-william-optics","13":"first","14":"instock","15":"featured","16":"taxable","17":"shipping-taxable","18":"purchasable","19":"product-type-simple"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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