5/16" washers Large hex-head bolt entityType: 'product' This product is available to ship Standard delivery within the 50 US states and US territories/protectorates address. Reflector mirrors are made from glass with different levels of thermal expansion. Dob Pod attaches securely to the base of your compatible Orion Dobsonian reflector and raises the entire telescope a full foot upwards for more convenient and comfortable stargazing. entityId: 99861, width: 160, In the field of amateur telescope making most, if not all, of its design features had been used before. entityId: 116324, It was popularized by John Dobson of the San Francisco Sidewalk Astronomers, who is also an honorary member of the Springfield Telescope Makers. Truss Dobsonians are the largest telescopes commercially available today. Dobsonians are popular in the amateur telescope making community, where the design was pioneered and continues to evolve. }, { Refractor telescopes refract, or "bend" incoming light to a focus by means of an objective lens. Thus a clamp mechanism is not needed to prevent unintentional motion of the telescope, unlike most other telescope mounts. }, { defaultImage: '', entityType: 'product' }, { }, { width: 160, height: 160, }, div.kids_pdp {float: left;width: 90%;clear: both;margin: 20px 5% 20px;} height: 160, The larger the aperture is the more light comes in the telescope and the brighter your image will be. However, it is usually atmospheric seeing conditions (not the telescope) which limits the actual resolving power on a given night; rarely is resolution less than one arc-second possible from even the best viewing locations on Earth. The telescope has two eyepieces that provide 152X and 50X magnification. You're already on our email list, height: 90, The FirstScope’s wide field-of-view provides bright, sharp views of the Moon’s mountains and craters in crisp detail. sourceSelector:'' Order received after noon will ship the next business day. Some initial assembly may be required. defaultImage: '', I want to see galaxies, nebulas & star clusters, Telescopes your whole family can use together, Features of the Skyquest XT8 Classic Dobsonian Telescope, How to Use Orion SkyQuest XT8 Classic Dobsonian Telescope, How To Set Up an Orion SkyQuest XT8 Classic Dobsonian Part 1, How To Set Up an Orion SkyQuest XT8 Classic Dobsonian Part 2, How To Collimate an Orion Reflector Telescope, Choosing a Telescope for Astronomy - The long version, Astronomy Under Light-Polluted Skies: What's to See, Orion SkyQuest XT8 Classic Dobsonian Telescope Kit, Orion Magnetic 3-Pound Dobsonian Counterweight, Orion Magnetic 1-Pound Dobsonian Counterweight, 9.45" ID Orion Full Aperture Solar Filter, 47"x13.5"x18.5" Orion Padded Telescope Case, Orion LaserMate Deluxe II Telescope Laser Collimator, Orion 1.25" Premium Telescope Accessory Kit, 10mm Orion Sirius Plossl Telescope Eyepiece, Dob Dolly for Orion 4.5-10" Dobsonian Telescopes, Dob Pod for Orion 4.5-10" Dobsonian Telescopes, Orion 9x50 Right-Angle Correct-Image Finder Scope, telescope and astrophotography accessories. }, { entityType: 'product' }, { [4], It is hard to classify the Dobsonian Telescope as a single invention. For Northern Hemisphere use. }, { layers: '10109' Threaded for 1.25" filters. layers: '08736' sourceSelector:'' The mirror box encloses the mirror cell and allows the entire telescope to rotate vertically. width: 90, }, { Plastic feet }, { Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger. layers: '08549' And the right-angle design allows for comfortable viewing. The popular Orion SkyQuest XT8 Classic Dobsonian also includes a quick collimation cap for easy mirror alignment, and dust caps for the reflector telescope tube and focuser. height: 90, layers: '05768' }, { The Crayford mechanism ensures all focus adjustments are smooth, accurate, and virtually free of backlash and flexure, even with heavier 2" accessories installed, so you can achieve precise focus easily. defaultImage: '', height: 160, layers: '07009' entityType: 'product' Larger EQ mounts that utilize very precise tracking and excellent stability are capable of longer exposure deep-sky photography. Limited Warranty against defects in materials or workmanship for one year from date of purchase. Includes a 2" Crayford focuser that accepts 1.25" and 2" telescope eyepieces, a 25mm Sirius Plossl eyepiece, an EZ Finder II reflex sight, collimation cap, Starry Night software download, and more. entityType: 'product' }, { Since the late 1990s many innovations in mount design and electronics by amateur telescope makers and commercial manufacturers have allowed users to overcome some of the limitations of the Dobsonian style altazimuth mount. Our second-gen model ensures seating exactly parallel to the focuser's mechanical axis for consistent and accurate alignment. In the daytime it will keep your telescope cooler so it will reach thermal equilibrium faster once night falls. For telescopes, the optical diameter (also known as aperture) is the size of a telescope's main light-collecting lens or primary mirror, measured in millimeters or inches. This Orion Solar Filter fits Orion 8" Dobsonians and Orion 8" Newtonian reflector optical tubes, allowing you to safely observe or image the Sun. Weighs 3 lbs. defaultImage: '', entityType: 'product' defaultImage: '', Cassegrain telescopes routinely use spheres in addition to other lenses in the optical path to correct for residual spherical aberration. The term Dobsonian is currently used for a range of large-aperture Newtonian reflectors that use some of the basic Dobsonian design characteristics, regardless of the materials from which they are constructed. height: 160, height: 160, The fan runs on eight (8) AA batteries that are provided by the customer. sourceURL:'/catalog/community_content_viewer_placeholder.jsp?productId=99866&isPDP=true', sourceSelector:'' Submit astronomy articles, events, & reviews, and even become a featured Orion customer! The distance from the center of a curved mirror or lens at which parallel light rays converge to a single point. Screws with round knob attached }, {"clickFunction":"function() {$(\'#_widget1120244123007\').widgetClass().scrollNext(\'#_widget1120244123007\');}","widgetClass":"ButtonWidget"}, {"snapClosest":true,"bindings":{"bind0":{"fn":"function(event, pageNum) { PagedDataSetFilmstripLoaderWidget.loadPage(\'#relatedCommunityItemsimage\', Math.floor(pageNum)); }","type":"scrollend","element":"#_widget1120244123007_trigger"}},"unitSize":200,"widgetClass":"SnapToScrollerWidget","scrollSpeed":500,"scrollAmount":600,"afterScroll":"","animateScroll":"true","beforeScroll":"","direction":"horizontal"}, {"emptyItemViewer":"

","imageThreshold":3,"pages":2,"dataModel":{"imageWidth":160,"cacheEntitiesInRequest":true,"isCommunityRelated":"true","entityId":"102005","entityTypeId":"4","relationTypeId":"19","dataProviderWidget":"com.fry.ocpsdk.widget.catalog.dataproviders.RelatedEntitiesDataProviderWidget","imageHeight":160,"itemViewerWidget":"com.fry.starter.widget.viewers.ItemViewerWithQuickLookWidget","isPDP":"true","direction":"horizontal"},"pageSize":4,"widgetClass":"PagedDataSetFilmstripLoaderWidget","loadThreshold":1,"direction":"horizontal"}, {"clickFunction":"function() {$(\'#_widget1120244123052\').widgetClass().scrollPrevious(\'#_widget1120244123052\');}","widgetClass":"ButtonWidget"}, { entityType: 'product' Free shipping on many items ... AstroGoods.com Custom Optimized Dobsonian Primary Mirror Cells. so you'll continue to be the first entityId: 15189, Dust cap entityType: 'product' }, { entityId: 15174, }, { Based on the Alt-Azimuth principal Dobsonian telescopes are fast and easy to set up. You can expand your magnification options by purchasing additional 1.25" or larger 2" wide-angle eyepieces of different focal lengths. Twist the body to provide a continuous range of power, perfect for lunar, planetary and deep-sky objects. height: 90, defaultImage: '', The 1200mm focal length (f/5.9) XT8 mirror allows you to obtain clear and crisp views at moderate to high magnifications on clear nights with good seeing conditions. }, { [19][20] sourceSelector:'' defaultImage: '', Enhanced-reflectivity mirror coatings boost the XT8 Classic Dobsonian's mirror to 94% reflectivity so as much light as possible is transmitted to the eyepiece, for clear and bright views. From our entry level beginner telescopes for amateur astronomers to our Dobsonian telescopes to our most advanced Cassegrain telescopes and accessories, you can find the best telescope for you. height: 160, }, { sourceSelector:'' 2 oz., with big grip handle and padded bottom. Feet attachment wood screws height: 90, layers: '04150' sourceURL:'/catalog/community_content_viewer_placeholder.jsp?productId=99897&isPDP=true', width: 160, 3 watching. sourceSelector:'' The mirror collects 78% more light than a 6" mirror, so you get a significant increase in ability to observe dust lanes in nebulas, resolve the cores of prominent globular star clusters, and to reveal some of the more subtle structures in faint galaxies. width: 160, The poles are held in place by quick-disconnecting clamps which allow the entire telescope to be easily broken down into its smaller components, facilitating their transport by vehicle or other means to an observing site. width: 200, Spring coils }, { }, { Nils Olof Carlin is seen here with his homebuilt portable 13.1-inch (33-cm) truss-tube Dobsonian reflector. entityId: 102356, defaultImage: '', layers: 'ap1853_7202013' }, { sourceSelector:'' defaultImage: '', [29], In the 21st century, truss Dobsonian models are also mass-produced by Meade, Orion, Explore Scientific and others. sourceURL:'/catalog/community_content_viewer_placeholder.jsp?productId=103071&isPDP=true', sourceSelector:'' The altitude trunnion style bearing in these designs becomes a large radius roughly equal to or greater than the radius of the objective mirror, attached to or integrated into the tube assembly which lowers the overall profile of the mount. entityId: 102784, and special offers. Any of these scopes will show you countless lunar craters, Saturn's rings and a myriad of star clusters and nebulas! entityId: 4150, entityType: 'product' entityId: 102125, It has a multi-coated lens that lets in more light and allows you to enjoy higher-power, sharper images without eye strain. [citation needed] John Dobson, credited as having invented this design in 1965 [5] pointed out that "for hundreds of years, wars were fought using cannon on "'Dobsonian' mounts". defaultImage: '', Lowest useful magnification is the power at which the exit pupil becomes 7mm in diameter. [33][34][35] The inherent simplicity and large aperture of the design began to attract interest through the 1970s since it offered the advantage of inexpensive large instruments that could be carried to dark sky locations and star parties in the back of a small car and set up in minutes.