{"product_id":"hubble-optics-telescopio-dobson-n-457-1860-ul18-f-4-premium-ultra-light-dob","title":"Hubble Optics Dobson Telescope N 457\/1860 UL18 f\/4 Premium Ultra Light DOB","description":"\u003cdiv class=\"product-description\" style=\"font-family:Arial,sans-serif;font-size:16px;line-height:1.7;color:#333;\"\u003e\n\n\u003ch1 style=\"font-size:24px;font-weight:bold;\"\u003eHubble Optics Dobsonian Telescope N 457\/1860 UL18 f\/4 Premium Ultra Light DOB\u003c\/h1\u003e\n\n\u003cp style=\"font-size:18px;margin-top:10px;\"\u003eA high-quality telescope with \u003cb\u003elarge aperture\u003c\/b\u003e and a \u003cb\u003elightweight, compact design\u003c\/b\u003e that has been optimized for extreme portability! \u003c\/p\u003e \u003cp\u003eThe UL18 offers such an aperture that it provides even the most demanding observers with a satisfying view. Despite its size, it can be easily transported to the desired observation site by a single person. The Hubble Optics UL18 not only offers a first-class optical experience but also weighs only about 32 kilograms - about a third of the weight of a classic Dobsonian telescope. Once disassembled, it takes on a compact shape and fits into any car. \u003c\/p\u003e \u003cp\u003eThe UL18 is the ideal combination of a telescope with huge light-gathering capacity and a unique, lightweight design. It will be the telescope that gets pulled out of the garage or the back of the car to be used frequently. You will enjoy breathtaking images of our universe and the pleasure of observing for a lifetime. \u003c\/p\u003e \u003cp\u003eThe UL18 has a parabolic primary mirror with an 18\" diameter for a total diameter of 18.4\". This gives you about 5% more optical surface than 18\" instruments from other manufacturers. In addition to the fast focal ratio, the Hubble UL18 has an eyepiece position that can almost always be reached while standing (approximately 172 cm from the ground when the UL18 is pointed at the zenith). \u003c\/p\u003e \u003cp\u003eThe Hubble UL18 is a telescope that will give you a lifetime of observation experiences you will be satisfied with. \u003c\/p\u003e \u003cp\u003e\u003cb\u003eThere are two versions with different focal ratios: f\/4 and f\/4.5\u003c\/b\u003e \u003c\/p\u003e \u003cp\u003e\u003cb\u003eAdvantages of f\/4.5:\u003c\/b\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eSharper images. No coma corrector needed! \u003c\/li\u003e \u003cli\u003eSmaller central obstruction \u003c\/li\u003e \u003cli\u003eEasier to set perfect collimation\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003e\u003cb\u003eAdvantages of f\/4:\u003c\/b\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eMost users will not need a ladder with this telescope, whereas with the f\/4.5 version, you might need a one-step ladder only if the telescope is pointed near the zenith. \u003c\/li\u003e \u003cli\u003eWider field of view\u003c\/li\u003e \u003c\/ul\u003e \u003cp\u003eBoth the f\/4 and f\/4.5 versions offer excellent images. The f\/4.5 focal ratio provides optimal optics for the most demanding observer - without the need for a coma corrector. A coma corrector is highly recommended for the UL18 f\/4. \u003c\/p\u003e \u003cp\u003e\u003cb\u003ePlease note\u003c\/b\u003e that the f\/4.5 version requires a counterweight, NOT included in the shipment. \u003c\/p\u003e \u003cp\u003e\u003cb\u003eSpecial features:\u003c\/b\u003e \u003cb\u003e\u003cbr\u003e\u003c\/b\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e \u003cb\u003eExclusive Sandwich Mirror Technology:\u003c\/b\u003e Hubble Optics' Sandwich Mirror technology has been used to produce scientific-grade optical elements, and after more than six years of successful applications in research facilities like NASA, the California State Polytechnic University San Luis Obispo, for the US military, and in amateur astronomy worldwide, it has proven itself a winner. The folding telescope design, with an open body and a closed back, not only allows air to circulate at the mirror level but also provides maximum strength, allowing for a simpler mirror cell design. \u003cb\u003eBut why is thermal balance so crucial?\u003c\/b\u003e The main problem is \"mirror seeing,\" the turbulence seen through the telescope's eyepiece when the air above the mirror is at a different temperature than the mirror itself. Because a sandwich mirror cools down much faster than a solid mirror of the same thickness, this major source of distortion is quickly eliminated, providing sharp and stable viewing conditions. \u003c\/li\u003e \u003cli\u003e \u003cb\u003eSemi-Enhanced Optical Coating\u003c\/b\u003e: The 92% enhanced optical coating ensures that the primary mirror collects as many photons as possible (scattering as few as possible) to produce a bright and re\u003c\/li\u003e \u003c\/ul\u003e\n\n\u003ch2 style=\"font-size:20px;margin-top:30px;\"\u003eKey features\u003c\/h2\u003e\n\n\u003cp\u003eHubble Optics quality for a reliable and rewarding observation experience.\u003c\/p\u003e\n\n\u003cul style=\"padding-left:20px;\"\u003e\n\n\u003cli\u003eType: Reflector\u003c\/li\u003e\n\n\u003cli\u003eAperture (mm): 457\u003c\/li\u003e\n\n\u003cli\u003eFocal length (mm): 1860\u003c\/li\u003e\n\n\u003cli\u003eAperture ratio (f\/): 4\u003c\/li\u003e\n\n\u003cli\u003eMount type: Dobsonian\u003c\/li\u003e\n\n\u003cli\u003eConstruction technique: Newton\u003c\/li\u003e\n\n\n\u003c\/ul\u003e\n\n\u003ch2 style=\"font-size:20px;margin-top:30px;\"\u003eMain technical specifications\u003c\/h2\u003e\n\n\u003ctable style=\"width:100%;border-collapse:collapse;margin-top:10px;\"\u003e\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eBrand\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eHubble Optics\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eModel\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eHubble Optics Dobsonian Telescope N 457\/1860 UL18 f\/4 Premium Ultra Light DOB\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eType\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eTelescopes\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eType\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eReflector\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eConstruction technique\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eNewton\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eAperture (mm)\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003e457\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eFocal length (mm)\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003e1860\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eAperture ratio (f\/)\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003e4\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eResolution power\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003e0.25\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eLimiting magnitude\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003e15.1\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eLight gathering capacity\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003e4260\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eMax. useful magnification\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003e914\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eTube structure\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eTruss tube\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eTube material\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eAluminum\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eSurface quality\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003e1\/10\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eSecondary mirror diameter (mm)\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003e90\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003eSecondary mirror obstruction\u003c\/td\u003e\n\n\u003ctd style=\"padding:8px;border:1px solid #ccc;\"\u003e28\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003cdiv style=\"background-color:#f0f8ff;padding:15px;margin-top:30px;border-left:4px solid #007acc;\"\u003e\n\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e\u003cbr\u003eTake advantage of free shipping throughout Italy for orders over €199.99!\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"Hubble Optics","offers":[{"title":"Default Title","offer_id":51120718348504,"sku":"53626","price":7883.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0766\/0722\/6072\/files\/0bf11fa5fbead62297311b0c0da8fb27.jpg?v=1764070281","url":"https:\/\/www.giordanoastronomia.it\/en\/products\/hubble-optics-telescopio-dobson-n-457-1860-ul18-f-4-premium-ultra-light-dob","provider":"Giordano 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