EXPLORE SCIENTIFIC 100° Ar Eyepiece 20mm (2")

Ultra Light Dobsonian 305mm GENERATION II - with completely redesigned and improved construction.No telescope type has influenced amateur astronomy as radically as the dobsonian telescope. Before the introduction of this telescope type by John Dobson the vast majority of amateur telescopes were small inadequate refractors on shaky mounts - just good enough to show the polar regions on mars or the rings of Saturn. Bigger telescopes, like the Schmidt-Cassegrain telescopes, were restricted to the relatively small group of amateurs that could afford them.The brilliant combination of simple - but effective - mechanics and the largest aperture available led to a worldwide triumph of this concept. No other telescope type offers you so much light for your money as a good dobson. We have taken the motto "held together by gravity and driven by yoghurt power" and offer a modern version of the classic - designed by amateur astronomers for amateur astronomers. Despite its large aperture the telescope can be transported easily even in small cars and is assembled within minutes without tools. The construction was optimized for maximum rigidity with a minimum of mass. The combination of big altitude wheels and a optimized aluminium-sandwich construction allows for small movements even at high magnifications. The focus position is already positioned to accept our coma-corrector. The ideal workhorse for the deep-sky enthusiast. A telescope with 305mm aperture gathers more than 1800-times more light than the naked eye. Details on planetary surfaces stand out even to unexperienced observers, and countless deep-sky objects show details. Bright globular clusters are resolved down to the core and the view of the lunar terminator will provide a unforgettable experience.Dimensions for mobile use: Rockerbox 450mmx450mmx320mm; Mirrorbox 380mmx380mmx300mm; Trusses approx. 980mmEyepiece Height while pointing at zenith approximately 1,4m.12“ Net total weight: 32,1 kg; 12“ Mirror Box: 18,9 kg; 12“ Secondary cage +Rockerbox: 10 kg; 12“ 4 Pairs of trusses: 1,8kg; 12“ Altitude Wheels: 1,4kg ; Focuser thread: M54 x 0.75 mm ; Backfocus: 45mm behind the 2" eyepiece holder. 35mm when the 1.25" adapter is mountedSPECIFICATIONS Truss-Dobsonian Telescope in full Aluminium constructionNEW: Slider bearings made from TEFLON und GFK for smooth and precise movementNEW: Improved main mirror cell with completely redesigned mechanicsNEW: Altitude bearings with new designed brake and friction systemNEW: Larger feet to improve stabilityNEW: Universal finder slot to enable an easy finder upgradeNEW: Counter-weight system included - 2 x 1.0 kg NEW: Quick-lock fasteners with new springloaded design for comfortable useNEW: Powder-coated yellow altitude wheels to improve durabilityNEW: Laser engraved central mark on main mirrorSCOPE OF DELIVERYTruss Dobsonian TelescopeLED finder with standard finder slotStray light shield for secondary cageMain mirror collimation toolBattery compartment with bag for fansCounter-weights 2 x 1.0 kgExtension tube for focuserReducer 2"/1.25"Manual

These eyepieces with their huge apparent field of view not only gave the observer a panoramic visual experience, but they relax the eye so the observer could pay attention to subtle details for extended periods.These ultra-wide angle eyepieces played a critical role in the military for aiming at targets, and their long eye-relief counterparts helped reduce eye injury from recoil.Each 100° Series Argon-Purged Waterproof eyepiece is internally sealed and purged with inert, dry argon gas to prevent internal fogging, to halt the intrusion of fine particulates and fungus. This also maximizes the life of the internal coatings. To make sure, every 100° eyepiece is tested by submerging them down to 1 meter of water for 30 minutes.All 100° Series eyepieces are fully multi-coated and edge-blackened to produce maximum contrast.

These eyepieces with their huge apparent field of view not only gave the observer a panoramic visual experience, but they relax the eye so the observer could pay attention to subtle details for extended periods. These ultra-wide angle eyepieces played a critical role in the military for aiming at targets, and their long eye-relief counterparts helped reduce eye injury from recoil.Each 100° Series Argon-Purged Waterproof eyepiece is internally sealed and purged with inert, dry argon gas to prevent internal fogging, to halt the intrusion of fine particulates and fungus. This also maximizes the life of the internal coatings.To make sure, every 100° eyepiece is tested by submerging them down to 1 meter of water for 30 minutes.All 100° Series eyepieces are fully multi-coated and edge-blackened to produce maximum contrast.

Explore Scientific 82° Series™ extreme wide field eyepieces are optimized to produce high contrast, high resolution, and superior flat field characteristics. The visual effect of these eyepieces with their long eye-relief and their 82° apparent field is truly a full-immersion experience. Your eye is relaxed, allowing you to easily use the "averted vision" technique to study faint details across a huge field-of-view. The 82° Series eyepieces come with a twist-up rubber eye-guard that raise to the desired height for the comfort of the observer, and as experienced astronomers know, eye comfort is critical when trying to observe at the visual limits of the telescope. To keep internal reflections to a minimum, all internal surfaces of the eyepiece barrel are flat black, as well as the edges of the lenses themselves to minimize the scattering of light within the lenses themselves. All 82° Series eyepieces are fully multi-coated and edge-blackened to produce maximum contrast.

These eyepieces with their huge apparent field of view not only gave the observer a panoramic visual experience, but they relax the eye so the observer could pay attention to subtle details for extended periods. These ultra-wide angle eyepieces played a critical role in the military for aiming at targets, and their long eye-relief counterparts helped reduce eye injury from recoil.Each 100° Series Argon-Purged Waterproof eyepiece is internally sealed and purged with inert, dry argon gas to prevent internal fogging, to halt the intrusion of fine particulates and fungus. This also maximizes the life of the internal coatings.To make sure, every 100° eyepiece is tested by submerging them down to 1 meter of water for 30 minutes. All 100° Series eyepieces are fully multi-coated and edge-blackened to produce maximum contrast.

The longest focal length in the 52° Series with the longest eye relief, the 40mm is also the only 2.0-inch O.D. eyepiece in this series. Explore Scientific now has three 40mm eyepieces in its collection, the other two are the 40mm 62° Series, and the 40mm 68° Series. At this focal length, this eyepiece is generally reserved for deep sky observers who challenge themselves to observe near the faintest observable limit of their telescopes. The huge true field of view is perfect for deep sky objects like the Andromeda Galaxy, the Rosette Nebula, as well as large star clusters, and comets.Comfort, Quality, Value. The Explore Scientific 52° LER Series mid-range focal length eyepieces are excellent flat-field multi-element oculars that can transform your visual astronomy experience. With an apparent field of view of 52 degrees, these eyepieces offer incredible value in a very nice eyepiece. Expect exceptional quality and value versus a comparably priced Plossl.  These eyepieces are the choice for observers wearing glasses - with excellent performance and durability. The rubber inlet and the foldable eyecups make handling and using in the field easy. The patented EMD-coating produces high contrast images and prevents reflexes and ghosting. The argon purging effectively prevents internal fogging, and you don´t have to deal with dirt, fungus or cleansing fluids getting between the lenses. The eyepieces are sealed - this makes sure you will be able to enjoy these eyepieces for many years to come.SPECIFICATIONSLarge eye distance, large field and great image sharpnessExcellent viewing position for people with glassesExcellent field sharpness even with fast optics52° apparent field of viewArgon-purging prevents internal fogging, the sealing facilitates cleaningPatented EMD-coating to maximize contrastBlackened lens edges to avoid reflexesAll eyepieces of this series are parfocalStainless steel barrel with conical security cutoffDust covers and protective bag includedSCOPE OF DELIVERY52° EyepieceDust coversProtective bag

Perfect for ambitious planetary observers: the set consists of the BRESSER Messier AR-152L/1200 Telescope and the modern EXOS-2 PMC-Eight GoTo Mount. With the large aperture and long focal length of 1200 mm, the high-quality optics deliver razor-sharp, high-contrast images that impress with every observation. The telescope is especially suitable for detailed views of Mars, Jupiter, and other celestial bodies. You can also explore the sun using the included objective filter. The mount is equipped with a precise GoTo control and is very easy to use with the intuitive ExploreStars App. Thanks to the extremely accurate tracking, the selected celestial object is guaranteed to always stay in the field of view. The Telescope For demanding planetary observers, the BRESSER Messier AR-152L is the dream device. Discover structures in Jupiter’s cloud bands, the finest grooves and craters on the moon’s surface, and structures on Mars, including the ice-covered polar caps of our neighboring planet! Observe the dance of Jupiter’s moons around the planet and discover the greenish glow of Uranus far beyond Saturn’s orbit. The combination of large aperture and long focal length enables sharp, high-contrast images that will impress you every time. And with the high-quality objective solar filter, you can also safely observe our own star. (Caution: Never point the telescope at the sun without a solar filter!) The Mount The EXPLORE SCIENTIFIC EXOS-2 PMC-Eight GoTo Mount is equipped with a modern and very precise GoTo control system. It consists of a robust Wi-Fi controller unit that provides all the necessary interfaces. The NEMA-11 stepper motors are directly connected to this unit via cable, and an ST-4 compatible autoguider interface is also available. In addition, the control system supports micro-stepping to ensure precise tracking. Intuitive operation via app and graphical star chart The ExploreStars App, developed specifically for the PMC-Eight system, impresses with a very well-designed, intuitive user interface. The currently available alignment stars for initializing the control system, as well as all celestial objects in the database, are displayed as a star chart with additional text information. All these objects can be easily viewed and selected. Powerful controller unit with Open GoTo for customization The heart of the controller unit consists of a completely autonomous 2-channel multi-processor with 8 CPUs and a Wi-Fi Ethernet 10/100 adapter with IP function. This allows remote operation via browser, ASCOM, app, or serial connection. The Open GoTo also allows you to write your own firmware and upload it to the controller unit. This enables custom adjustments to the device’s functions as well as the creation of custom object lists, etc. Polar finder included The included and pre-installed polar finder scope allows for quick and precise alignment and long exposure times without unwanted star trails. The integrated LED lighting unit further enhances the comfort of using the polar finder. TELESCOPE FEATURES Design: Refractor telescopeAperture: 152 mm / Focal length: 1200 mm / F/7.9Maximum useful magnification: 254xTelescope for night and solar observation High-quality, bright achromatic lens Modern multi-coating of the lenses for bright and high-contrast images Robust aluminum tube construction Very high-quality Hexafoc focuser with 2.5'' free internal diameter 8x50 finder with crosshair eyepiece Optimized finder bracket for comfortable viewing 31.7 mm (1.25'') star diagonal mirror Handle for comfortable transport with integrated camera holder (photo thread) Smartphone adapter for sky navigation included Prism rail with stainless steel clamping surface (44-mm universal dovetail for GP/EQ5/LXD75) 50.8 mm to 31.7 mm adapter with integrated T2 adapter (optional T2 ring required) MOUNT FEATURES Powerful PMC-8 Open GoTo system User-friendly and graphically appealing ExploreStars OpenGoto App Wi-Fi control via tablet, notebook, or desktop PC with at least 7'' display and Wi-Fi function (not included) Compatible operating systems: WIN8.1, WIN10/11, iOS, or Android 4.4 and higher Classic control via directional buttons or joystick for guiding, centering, correcting, and moving with a touchscreen Intuitive 2-star and 3-star alignment for GoTo control initialization Multiprocessor microcontroller with 8 CPUs (processor cores) Micro-stepper motors NEMA-11 Highly precise and quiet belt drive ST-4 compatible autoguider interface ASCOM driver available, also supports pulse guiding Possibility to create your own firmware and object lists and load them into the PMC-8 GPS compatible / settings depend on the computer or tablet used Power supply via 12V DC, power consumption at full load max. 1.6 amps SCOPE OF DELIVERY Optical tube 26 mm Super Plössl eyepiece 31.7 mm (1.25") 31.7 mm (1.25") star diagonal mirror Integrated 31.7 mm and T2 adapter Prism rail with stainless steel clamping surface Adapter for 50.8 mm (2") eyepieces Rotating star map Objective solar filter Tube rings with carrying handle and camera holder 8x50 finder scope Smartphone adapter for navigation Astronomy PC software Stellarium (downloadable) EXOS2-GT mount with Open GoTo PMC-8 Stainless steel tripod with built-in bubble level Counterweight 2 x 4.5 kg Polar finder with lighting unit Power supply 12V / 2A ExploreStars App (software download) User manual