{"product_id":"hubble-optics-ul20-20-inch-premium-ultra-light-dobsonian-telescope","title":"Hubble Optics UL20 20 Inch Premium Ultra Light Dobsonian Telescope","description":"\u003cp data-end=\"248\" data-start=\"193\"\u003e\u003cstrong data-end=\"248\" data-start=\"193\"\u003eHubble UL20 – A Lightweight 20\" Dobsonian Telescope\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"428\" data-start=\"250\"\u003eThe Hubble UL20 is a made-to-order 20-inch Dobsonian telescope designed for observers who want truly extreme aperture without the bulk and weight of traditional large Dobsonians.\u003c\/p\u003e\n\u003cp data-end=\"719\" data-start=\"430\"\u003eWith its enormous 20-inch primary mirror, the UL20 gathers over six times more light than an 8-inch telescope, and almost three times the light grasp of a 12-inch, revealing galaxies, nebulae, and fine structure at a level normally reserved for permanent observatory installations.\u003c\/p\u003e\n\u003ch3 data-end=\"770\" data-start=\"721\"\u003eA Premium, Light, Compact and Portable Design\u003c\/h3\u003e\n\u003cp data-end=\"1021\" data-start=\"772\"\u003eDespite its size, the UL20 is engineered to remain practical and transportable. The precision-machined all-metal truss construction delivers exceptional rigidity while keeping overall weight to around half that of traditional 20-inch Dobsonians.\u003c\/p\u003e\n\u003cp data-end=\"1275\" data-start=\"1023\"\u003eThe modular truss design allows the telescope to be broken down for transport, while the reinforced mirror box protects the primary mirror during storage and travel. This makes the UL20 a genuine “portable observatory” for dedicated deep-sky observers.\u003c\/p\u003e\n\u003ch3 data-end=\"1300\" data-start=\"1277\"\u003eOptical Performance\u003c\/h3\u003e\n\u003cp data-end=\"1597\" data-start=\"1302\"\u003eAt the heart of the UL20 is a premium parabolic primary mirror, individually tested and finished to achieve diffraction-limited performance (Strehl 0.95+). The secondary mirror is specified to 1\/10 wave or better, ensuring excellent contrast and pinpoint stellar images across the field.\u003c\/p\u003e\n\u003cp data-end=\"1860\" data-start=\"1599\"\u003eBoth mirrors receive 96% enhanced reflective coatings, maximising light throughput while reducing scatter. This results in breathtaking deep-sky views, extremely faint object detection, and exceptional planetary performance even at very high magnifications.\u003c\/p\u003e\n\u003chr data-end=\"1865\" data-start=\"1862\"\u003e\n\u003ch3 data-end=\"1900\" data-start=\"1867\"\u003eChoose Your Telescope Control\u003c\/h3\u003e\n\u003cp data-end=\"2043\" data-start=\"1902\"\u003eThe UL20 can be customised to suit your observing style. You can use it fully manually, or opt for Guided Push-To or Automatic Go-To systems.\u003c\/p\u003e\n\u003cp data-end=\"2286\" data-start=\"2045\"\u003e\u003cstrong data-end=\"2060\" data-start=\"2045\"\u003eManual Mode\u003c\/strong\u003e\u003cbr data-end=\"2063\" data-start=\"2060\"\u003eEven without electronics, the UL20 remains a precision Dobsonian with smooth, stable bearings and a well-balanced truss structure. This allows for classic hands-on observing with direct control and intuitive sky navigation.\u003c\/p\u003e\n\u003cp data-end=\"2608\" data-start=\"2288\"\u003e\u003cstrong data-end=\"2314\" data-start=\"2288\"\u003eGuided Push-To Version\u003c\/strong\u003e\u003cbr data-end=\"2317\" data-start=\"2314\"\u003eThe UL20 Guided Push-To version features the SkyHub2 digital setting circle system, providing accurate real-time telescope positioning without motorised tracking. High-resolution 8192 PPR encoders on both axes continuously update your telescope’s position in compatible planetarium software.\u003c\/p\u003e\n\u003cul data-end=\"2982\" data-start=\"2610\"\u003e\n\u003cli data-end=\"2691\" data-start=\"2610\"\u003e\n\u003cp data-end=\"2691\" data-start=\"2612\"\u003eFast one-star alignment, with optional two-star alignment for higher accuracy\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2783\" data-start=\"2692\"\u003e\n\u003cp data-end=\"2783\" data-start=\"2694\"\u003eCompatible with SkySafari, Stellarium, Cartes du Ciel, TheSky, and other ASCOM software\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2837\" data-start=\"2784\"\u003e\n\u003cp data-end=\"2837\" data-start=\"2786\"\u003eWorks on Windows, macOS, Android, and iOS devices\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2923\" data-start=\"2838\"\u003e\n\u003cp data-end=\"2923\" data-start=\"2840\"\u003eExtremely low power consumption, up to 100 hours from a 15,000 mAh USB power bank\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2982\" data-start=\"2924\"\u003e\n\u003cp data-end=\"2982\" data-start=\"2926\"\u003eWiFi and Bluetooth supported (WiFi only for iOS devices)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"3253\" data-start=\"2984\"\u003e\u003cstrong data-end=\"3011\" data-start=\"2984\"\u003eAutomatic Go-To Version\u003c\/strong\u003e\u003cbr data-end=\"3014\" data-start=\"3011\"\u003eThe UL20 Go-To version adds fully motorised pointing and tracking for a hands-free observing experience. It includes a smart hand controller with a 30,000-object database and supports advanced 1–9 star alignment for high pointing accuracy.\u003c\/p\u003e\n\u003cul data-end=\"3583\" data-start=\"3255\"\u003e\n\u003cli data-end=\"3356\" data-start=\"3255\"\u003e\n\u003cp data-end=\"3356\" data-start=\"3257\"\u003eBuilt-in encoders and real-time clock maintain accurate sidereal, lunar, and solar tracking rates\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3442\" data-start=\"3357\"\u003e\n\u003cp data-end=\"3442\" data-start=\"3359\"\u003eControl via WiFi or Bluetooth using SkySafari, Stellarium, or ASCOM\/INDI software\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3502\" data-start=\"3443\"\u003e\n\u003cp data-end=\"3502\" data-start=\"3445\"\u003eCompatible with Windows, macOS, Linux, iOS, and Android\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3583\" data-start=\"3503\"\u003e\n\u003cp data-end=\"3583\" data-start=\"3505\"\u003eAdjustable slew and guide speeds, spiral search, and park\/unpark functionality\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-end=\"3588\" data-start=\"3585\"\u003e\n\u003ch3 data-end=\"3642\" data-start=\"3590\"\u003eChoosing Your Focal Ratio: f\/3.3, f\/3.7 or f\/4.2\u003c\/h3\u003e\n\u003cp data-end=\"3765\" data-start=\"3644\"\u003eThe UL20 is available in three focal ratios, allowing you to balance comfort, optical performance, and field of view.\u003c\/p\u003e\n\u003cp data-end=\"3790\" data-start=\"3767\"\u003e\u003cstrong data-end=\"3788\" data-start=\"3767\"\u003eWhy choose f\/4.2?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"4094\" data-start=\"3791\"\u003e\n\u003cli data-end=\"3850\" data-start=\"3791\"\u003e\n\u003cp data-end=\"3850\" data-start=\"3793\"\u003eSharper images with almost 50% less coma than f\/3.7\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3916\" data-start=\"3851\"\u003e\n\u003cp data-end=\"3916\" data-start=\"3853\"\u003eSmaller central obstruction (3.5\" secondary vs 4.0\" on f\/3.7)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"3958\" data-start=\"3917\"\u003e\n\u003cp data-end=\"3958\" data-start=\"3919\"\u003eEasier to achieve perfect collimation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4029\" data-start=\"3959\"\u003e\n\u003cp data-end=\"4029\" data-start=\"3961\"\u003eBetter suited for high-magnification lunar and planetary observing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4094\" data-start=\"4030\"\u003e\n\u003cp data-end=\"4094\" data-start=\"4032\"\u003eA coma corrector is helpful but not essential for many users\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"4128\" data-start=\"4096\"\u003e\u003cstrong data-end=\"4126\" data-start=\"4096\"\u003eWhy choose f\/3.3 or f\/3.7?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"4347\" data-start=\"4129\"\u003e\n\u003cli data-end=\"4223\" data-start=\"4129\"\u003e\n\u003cp data-end=\"4223\" data-start=\"4131\"\u003eNo ladder required at all for f\/3.3; only a small step may be needed for f\/4.2 near zenith\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4284\" data-start=\"4224\"\u003e\n\u003cp data-end=\"4284\" data-start=\"4226\"\u003eExtremely wide true field of view, especially with f\/3.3\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"4347\" data-start=\"4285\"\u003e\n\u003cp data-end=\"4347\" data-start=\"4287\"\u003eIdeal for sweeping large nebulae and rich Milky Way fields\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"4528\" data-start=\"4349\"\u003eAll three versions deliver extraordinary performance. A coma corrector is strongly recommended for the UL20 f\/3.3, while the f\/4.2 prioritises optical cleanliness and ease of use.\u003c\/p\u003e\n\u003cp data-end=\"4789\" data-start=\"4530\"\u003eThanks to Hubble’s two-section truss design for f\/4.2 (single-section for f\/3.3 and f\/3.7), all versions remain equally rigid and transportable. Please note that counterweights may be required for balance, depending on configuration, and are not included.\u003c\/p\u003e\n\u003chr data-end=\"4794\" data-start=\"4791\"\u003e\n\u003ch3 data-end=\"4820\" data-start=\"4796\"\u003eSpecifications (UL20)\u003c\/h3\u003e\n\u003cstyle\u003e\n  .spec-table { width: 100%; border-collapse: collapse; }\n  .spec-table th, .spec-table td {\n    padding: 10px 12px;\n    border-bottom: 1px solid #e5e5e5;\n    vertical-align: top;\n    white-space: normal;\n    word-break: break-word;\n    overflow-wrap: anywhere;\n  }\n  .spec-table th { width: 40%; text-align: left; font-weight: 600; }\n  .spec-table td { width: calc(100% - 40%); }\n  .spec-title { margin: 0 0 10px; font-weight: 700; }\n\u003c\/style\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical design\u003c\/th\u003e\n\u003ctd\u003eReflector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical diameter\u003c\/th\u003e\n\u003ctd\u003e20\" (508 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal length\u003c\/th\u003e\n\u003ctd\u003e~1676 mm (f\/3.3)\u003cbr\u003e~1880 mm (f\/3.7)\u003cbr\u003e~2134 mm (f\/4.2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal ratio\u003c\/th\u003e\n\u003ctd\u003ef\/3.3, f\/3.7, f\/4.2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEyepiece height at zenith\u003c\/th\u003e\n\u003ctd\u003e~1490 mm (f\/3.3)\u003cbr\u003e~1745 mm (f\/3.7)\u003cbr\u003e~2000 mm (f\/4.2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptics type\u003c\/th\u003e\n\u003ctd\u003eParabolic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEyepieces\u003c\/th\u003e\n\u003ctd\u003eNot included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical quality\u003c\/th\u003e\n\u003ctd\u003eDiffraction limited++ (Strehl 0.95+ primary\u003cbr\u003e1\/10 λ PV secondary)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFinder scope\u003c\/th\u003e\n\u003ctd\u003eNot included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocuser\u003c\/th\u003e\n\u003ctd\u003e2\" dual-speed linear bearing Crayford (50.8 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSecondary mirror\u003c\/th\u003e\n\u003ctd\u003e100 mm (f\/3.3\u003cbr\u003ef\/3.7)\u003cbr\u003e90 mm (f\/4.2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSecondary mirror obstruction by diameter\u003c\/th\u003e\n\u003ctd\u003e19.7% (f\/3.3\u003cbr\u003ef\/3.7)\u003cbr\u003e17.7% (f\/4.2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSecondary mirror obstruction by area\u003c\/th\u003e\n\u003ctd\u003e3.9% (f\/3.3\u003cbr\u003ef\/3.7)\u003cbr\u003e3.1% (f\/4.2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMirror coatings \/ over-coatings\u003c\/th\u003e\n\u003ctd\u003e96% Enhanced coating on primary and secondary mirrors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTube material\u003c\/th\u003e\n\u003ctd\u003e6063-T6 Aluminium Alloy tubes with black zinc-plated steel knob screws\u003cbr\u003ealuminium alloy main structure (OTA and mount) and steel mirror cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLength of optical tube\u003c\/th\u003e\n\u003ctd\u003e~1850 mm (f\/3.3\u003cbr\u003ef\/3.7)\u003cbr\u003e~2110 mm (f\/4.2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight, optical tube\u003c\/th\u003e\n\u003ctd\u003e~34.5 kg (f\/3.3\u003cbr\u003ef\/3.7)\u003cbr\u003e~35 kg (f\/4.2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight, fully assembled\u003c\/th\u003e\n\u003ctd\u003e~40 kg (f\/3.3\u003cbr\u003ef\/3.7)\u003cbr\u003e~40.5 kg (f\/4.2)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDawes Limit\u003c\/th\u003e\n\u003ctd\u003e0.19″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRayleigh Limit\u003c\/th\u003e\n\u003ctd\u003e0.23″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLimiting Magnitude\u003c\/th\u003e\n\u003ctd\u003e16.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaximum Magnification\u003c\/th\u003e\n\u003ctd\u003e1200×\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAdditional \/ optional accessories\u003c\/th\u003e\n\u003ctd\u003e8×50 Finder\u003cbr\u003eTube Shroud\u003cbr\u003eWheelbarrow handles\u003cbr\u003eVinyl foam cushioned grips\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOther features\u003c\/th\u003e\n\u003ctd\u003eSling lateral support and deluxe push-pull brass knob collimation screws\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Hubble Optics","offers":[{"title":"f\/4.2 \/ Manual","offer_id":44568346198085,"sku":null,"price":10690.0,"currency_code":"AUD","in_stock":true},{"title":"f\/4.2 \/ Guided Push-To","offer_id":44568346230853,"sku":null,"price":11190.0,"currency_code":"AUD","in_stock":true},{"title":"f\/4.2 \/ Automatic Go-To","offer_id":44568346263621,"sku":null,"price":14090.0,"currency_code":"AUD","in_stock":true},{"title":"f\/3.7 \/ Manual","offer_id":44568346296389,"sku":null,"price":12090.0,"currency_code":"AUD","in_stock":true},{"title":"f\/3.7 \/ Guided Push-To","offer_id":44568346329157,"sku":null,"price":12590.0,"currency_code":"AUD","in_stock":true},{"title":"f\/3.7 \/ Automatic Go-To","offer_id":44568346361925,"sku":null,"price":15490.0,"currency_code":"AUD","in_stock":true},{"title":"f\/3.3 \/ Manual","offer_id":44568367267909,"sku":null,"price":13590.0,"currency_code":"AUD","in_stock":true},{"title":"f\/3.3 \/ Guided Push-To","offer_id":44568367300677,"sku":null,"price":14090.0,"currency_code":"AUD","in_stock":true},{"title":"f\/3.3 \/ Automatic Go-To","offer_id":44568367333445,"sku":null,"price":16990.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0609\/6673\/1845\/files\/Untitleddesign_41_5e85e594-c5c3-4dd8-89ca-a7039f0d5503.jpg?v=1769131648","url":"https:\/\/bintel.com.au\/products\/hubble-optics-ul20-20-inch-premium-ultra-light-dobsonian-telescope","provider":"The Binocular and Telescope Shop","version":"1.0","type":"link"}