{"id":90321,"date":"2025-11-29T09:30:10","date_gmt":"2025-11-29T08:30:10","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&#038;p=90321"},"modified":"2026-08-23T15:09:02","modified_gmt":"2026-08-23T13:09:02","slug":"sky-watcher-skymax-90-ota","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/sky-watcher-skymax-90-ota\/","title":{"rendered":"Sky-Watcher Skymax-90 (OTA) - 90mm f\/13.9 Maksutov-Cassegrain"},"content":{"rendered":"<h2>Sky-Watcher SkyMax-90 (OTA): The pocket-sized planet telescope<\/h2>\n<p>The Sky-Watcher SkyMax-90 is a 90mm aperture, 1250mm focal length (f\/13.9) Maksutov-Cassegrain in a tube that fits in almost any bag. This is the optical tube assembly (OTA) only, without a mount: you can place it on your own mount or via the camera tripod adapter onto a sturdy photo tripod. Maximum planetary sharpness per euro and per kilogram.<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-MC-90-1250-Maksutov-Telescoop-SkyMax-OTA-2.jpg\" alt=\"Sky-Watcher SkyMax-90 Maksutov-Cassegrain Optical Tube\" class=\"wp-image-90322\" title=\"\"><\/figure>\n<h2>What do you see through the SkyMax-90?<\/h2>\n<p>The moon shows razor-sharp craters, mountain ranges, and play of shadows. Jupiter displays its cloud bands, Saturn its rings, and Venus its phases. Double stars are split surprisingly well for their size with this optics. Bright deep-sky objects like the Orion Nebula are also possible, but the narrow field of view makes planets and the moon its true specialty.<\/p>\n<h2>Loose tubing: your mounting, your choice<\/h2>\n<p>The OTA version is for those who already have a mount or want to travel light. Thanks to the standard tripod adapter, it also works on a sturdy tripod for lunar, planetary, and daytime nature observation. The 1.25-inch connection with a 90-degree star diagonal makes comfortable viewing immediately possible.<\/p>\n<h2>This is how to get the most out of this telescope<\/h2>\n<ul>\n<li><strong>Give the thick correction lens cooling time:<\/strong> 30 to 45 minutes outside before looking at high magnification. A Maksutov rewards patience with a rock-steady image.<\/li>\n<li><strong>Protect against dew<\/strong> The front-mounted meniscus lens fogs up faster than a mirror. A dew shield is the most useful first upgrade for this type of telescope.<\/li>\n<li><strong>Virtually maintenance-free<\/strong> The closed tube keeps dust out and collimation is rarely an issue. Set it down and look.<\/li>\n<li><strong>Magnification:<\/strong> The 10 mm eyepiece already provides 125x magnification; exactly what this optics are made for. Adding more magnification rarely makes sense in the Dutch climate.<\/li>\n<li><strong>Plan with the moon:<\/strong> Around the first quarter you see the most detail along the terminator. Our <a href=\"https:\/\/www.telescoop.nl\/en\/moon-calendar\/\">lunar calendar<\/a> have the best nights in a row.<\/li>\n<\/ul>\n<h2>For whom yes and for whom no<\/h2>\n<p><strong>Hello<\/strong> moon and planet watchers, city and balcony observers (bright targets are less affected by light pollution), and travelers who want a short, maintenance-free tube. Still unsure about the type? Our <a href=\"https:\/\/www.telescoop.nl\/en\/the-best-telescope-for-beginners\/\">Telescope Buying Guide for Beginners<\/a> List the considerations.<\/p>\n<p><strong>Not<\/strong> For wide deep-sky fields, the field of view of this long focal length is too narrow; a short Newton would be a better fit. If you want a complete set with a mount, consider the SkyMax-90 EQ1 or one of the 102 bundles. Long exposure astrophotography is suited for the <a href=\"https:\/\/www.telescoop.nl\/en\/telescopes\/smart-telescopes\/\">smart telescopes<\/a>; moon photos with a smartphone adapter are actually a strong point on a Maksutov.<\/p>\n<h2>Featured accessories<\/h2>\n<p>These accessories add the most after purchase:<\/p>\n<ul>\n<li><strong>Moon Filter 25%:<\/strong> at this long focal length, the moon is the main course, and bright. The <a href=\"https:\/\/www.telescoop.nl\/en\/omegon-moon-filter-25-125\/\">Omegon Moon Filter 25% (1.25 inches)<\/a> dims the light and increases the contrast. More explanation in our <a href=\"https:\/\/www.telescoop.nl\/en\/best-moon-filter-telescope\/\">Moon filter guide<\/a>.<\/li>\n<li><strong>Smartphone adapter:<\/strong> It\u2019s precisely with a Maksutov, with its long brand focal length, that moon photos taken with a phone are impressive. The <a href=\"https:\/\/www.telescoop.nl\/en\/sky-watcher-smartphoto-plus-smartphone-adapter-20mm-eyepiece\/\">Sky-Watcher SmartPhoto+ adapter<\/a> comes with a special 20 mm photo eyepiece.<\/li>\n<li><strong>Carrier bag<\/strong> The short tube calls for a compact bag. Check out the <a href=\"https:\/\/www.telescoop.nl\/en\/telescope-accessories\/carrier-bags\/\">carrier bags<\/a> and choose the size that fits.<\/li>\n<\/ul>\n<h2>Technical specifications<\/h2>\n<table class=\"has-fixed-layout\">\n<thead>\n<tr>\n<th>Feature<\/th>\n<th>Description<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Type<\/td>\n<td>Reflector<\/td>\n<\/tr>\n<tr>\n<td>Design<\/td>\n<td>Maksutov<\/td>\n<\/tr>\n<tr>\n<td>Aperture (mm)<\/td>\n<td>90<\/td>\n<\/tr>\n<tr>\n<td>Focal length (mm)<\/td>\n<td>1250<\/td>\n<\/tr>\n<tr>\n<td>Focal Ratio (f\/)<\/td>\n<td>13,9<\/td>\n<\/tr>\n<tr>\n<td>Resolution<\/td>\n<td>1,28\u2033<\/td>\n<\/tr>\n<tr>\n<td>Limit value (mag)<\/td>\n<td>11,6<\/td>\n<\/tr>\n<tr>\n<td>Light output<\/td>\n<td>170\u00d7<\/td>\n<\/tr>\n<tr>\n<td>Max. useful magnification<\/td>\n<td>180\u00d7<\/td>\n<\/tr>\n<tr>\n<td>Tube weight (kg)<\/td>\n<td>1,4<\/td>\n<\/tr>\n<tr>\n<td>Tube construction<\/td>\n<td>Full tube<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"wp-block-columns is-layout-flex\">\n<div class=\"wp-block-column\" style=\"flex-basis:38%\">\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-MC-90-1250-Maksutov-Telescoop-SkyMax-OTA-1.jpg\" alt=\"Sky-Watcher SkyMax-90 Maksutov-Cassegrain Optical Tube, Product Photo 2\" class=\"wp-image-90323\" title=\"\"><\/figure>\n<\/div>\n<div class=\"wp-block-column\" style=\"flex-basis:62%\">\n<h2>Included in the box<\/h2>\n<ul>\n<li>Sky-Watcher SkyMax-90 Optical Tube Assembly (OTA, telescope only)<\/li>\n<li>Eyepieces: 25 mm, 10 mm (1.25\u2033)<\/li>\n<li>Viewfinder: red dot finder<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<h2>Honest advice from observers<\/h2>\n<p>We sell and use the Sky-Watcher line ourselves. In our <a href=\"https:\/\/www.telescoop.nl\/en\/skywatcher-telescopes\/\">Sky-Watcher merk Guide<\/a> We'll explain which series are strong and which you'd rather skip. View the full range on our <a href=\"https:\/\/www.telescoop.nl\/en\/brands\/sky-watcher\/\">Sky-Watcher merk Page<\/a>. Order before 11:59 PM for fast delivery, in the Netherlands and Belgium.<\/p>","protected":false},"excerpt":{"rendered":"<p>The <strong>Sky-Watcher SkyMax-90 (OTA)<\/strong> is a 90\/1250 mm Maksutov-Cassegrain a pocket-sized scope: maximum moon and planet sharpness in a tube that fits in almost any bag. Optical tube assembly with T-thread adapter, 1.25 inch adapter and star diagonal.<\/p>","protected":false},"featured_media":97899,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false},"product_brand":[542],"product_cat":[51,568,3172,3169],"product_tag":[],"class_list":["post-90321","product","type-product","status-publish","has-post-thumbnail","product_brand-sky-watcher","product_cat-telescopen","product_cat-catadioptrische-telescopen","product_cat-maksutov-ota","product_cat-maksutov-cassegrain-telescopen","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":[24771,91099,90398],"acf":[],"jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":90324,"url":"https:\/\/www.telescoop.nl\/en\/sky-watcher-skymax-102-ota\/","url_meta":{"origin":90321,"position":0},"title":"Sky-Watcher Skymax-102 (OTA) - 102mm f\/12.7 Maksutov-Cassegrain","author":"Info telescoop","date":"29-11-2025","format":false,"excerpt":"De Sky-Watcher SkyMax-102 (OTA) is een Maksutov-Cassegrain van 102\/1300 mm: contrastrijke maan- en planeetbeelden in een korte, gesloten buis. Losse optiek met fotostatief-aansluiting, 1,25 inch aansluiting en star diagonal.","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\/Skywatcher-MC-102-1300-SkyMax-102T-Maksutov-Telescoop-OTA-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":90327,"url":"https:\/\/www.telescoop.nl\/en\/sky-watcher-skymax-127-127-1500-maksutov\/","url_meta":{"origin":90321,"position":1},"title":"Sky-Watcher Skymax-127 \u2013 127\/1500 Maksutov-Cassegrain","author":"Abdullah Ibrar","date":"29-11-2025","format":false,"excerpt":"De Sky-Watcher SkyMax-127 (OTA) is de bekendste planetenoptiek van Sky-Watcher: 127\/1500 mm Maksutov-Cassegrain in een buis van 33 cm. Losse buis met twee oculairs en red dot zoeker, ideaal als tweede optiek naast een Newton.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"SKYMAX-127 OTA compacte Maksutov-Cassegrain optische buis schuin van voren met rode puntzoeker en groene zwaluwstaartplaat","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-127-1500-SkyMax-127T-OTA-8.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-127-1500-SkyMax-127T-OTA-8.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-127-1500-SkyMax-127T-OTA-8.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-127-1500-SkyMax-127T-OTA-8.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":90317,"url":"https:\/\/www.telescoop.nl\/en\/sky-watcher-skymax-180-pro-180-2700\/","url_meta":{"origin":90321,"position":2},"title":"Sky-Watcher Skymax-180 PRO \u2013 180\/2700 Maksutov-Cassegrain","author":"Abdullah Ibrar","date":"29-11-2025","format":false,"excerpt":"De Sky-Watcher SkyMax-180 PRO (OTA) is het ultieme planeetinstrument van de serie: 180\/2700 mm Maksutov (f\/15) met cultstatus onder planeetwaarnemers. Losse buis met twee oculairs en 9x50 zoeker, voor op een zware eigen montering.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"SKYMAX-180 PRO OTA 180mm f\/15 Maksutov-Cassegrain optical tube in black and white finish with finderscope attached.","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-180-2700-SkyMax-180-Pro-OTA-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-180-2700-SkyMax-180-Pro-OTA-2.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-180-2700-SkyMax-180-Pro-OTA-2.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-180-2700-SkyMax-180-Pro-OTA-2.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":90337,"url":"https:\/\/www.telescoop.nl\/en\/sky-watcher-skymax-150-pro-150-1800\/","url_meta":{"origin":90321,"position":3},"title":"Sky-Watcher Skymax-150 PRO \u2013 150\/1800 Maksutov-Cassegrain","author":"Abdullah Ibrar","date":"29-11-2025","format":false,"excerpt":"De Sky-Watcher SkyMax-150 PRO (OTA) is een Maksutov-Cassegrain van 150\/1800 mm (f\/12) in een buis van 40 cm: maximale planeet- en maanscherpte voor op een eigen stevige montering. Inclusief 28 mm 2 inch LET-oculair en 9x50 zoeker.","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\/Skywatcher-Maksutov-telescoop-MC-150-1800-SkyMax-OTA.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-150-1800-SkyMax-OTA.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-150-1800-SkyMax-OTA.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-150-1800-SkyMax-OTA.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":89793,"url":"https:\/\/www.telescoop.nl\/en\/sky-watcher-skymax-90-eq1\/","url_meta":{"origin":90321,"position":4},"title":"Sky-Watcher Skymax-90 EQ1 - 90mm f\/13.9 Maksutov Cassegrain","author":"Info telescoop","date":"27-11-2025","format":false,"excerpt":"De Sky-Watcher SkyMax-90 EQ1 is een complete planetenset: 90\/1250 mm Maksutov-Cassegrain op equatoriale montering met fijninstelling, ideaal om objecten op hoge vergroting rustig te volgen.","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\/Skywatcher-MC-90-1250-SkyMax-EQ-1-Maksutov-Telescoop-2.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":90030,"url":"https:\/\/www.telescoop.nl\/en\/sky-watcher-skymax-127-eq3-pro-synscan\/","url_meta":{"origin":90321,"position":5},"title":"Sky-Watcher Skymax-127 EQ3 Pro SynScan \u2013 127\/1500 Maksutov-Cassegrain","author":"Abdullah Ibrar","date":"28-11-2025","format":false,"excerpt":"De Sky-Watcher SkyMax-127 EQ3 Pro SynScan is de draagbaarste equatoriale GoTo-planeetset van de serie: de bekende 127\/1500 mm optiek (buis 3,4 kg) met automatisch zoeken en volgen van 42.900+ objecten.","rel":"","context":"Similar post","block_context":{"text":"Similar post","link":""},"img":{"alt_text":"Skymax 127 EQ3 Pro SynScan Maksutov-Cassegrain op EQ3 Pro equatoriale montering met statief en GoTo-handcontroller, schuin aanzicht op witte achtergrond.","src":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-127-1500-SkyMax-127-EQ3-Pro-SynScan-GoTo-4.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-127-1500-SkyMax-127-EQ3-Pro-SynScan-GoTo-4.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-127-1500-SkyMax-127-EQ3-Pro-SynScan-GoTo-4.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/www.telescoop.nl\/wp-content\/uploads\/2025\/11\/Skywatcher-Maksutov-telescoop-MC-127-1500-SkyMax-127-EQ3-Pro-SynScan-GoTo-4.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product\/90321","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=90321"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media\/97899"}],"wp:attachment":[{"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/media?parent=90321"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_brand?post=90321"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_cat?post=90321"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.telescoop.nl\/en\/wp-json\/wp\/v2\/product_tag?post=90321"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}