![]() The Secondary Mirror is attached to an adjustable Mirror Cell, and this assembly is held in place by a new (improved Oct. The Secondary Mirror diverts the light from the Primary Mirror to the side and beyond the Focuser. ![]() This Secondary Mirror is supported in a tilted position so that to the light path the obstruction appears circular. The light entering the telescope is gathered and then reflects forward in a converging beam, to the elliptical Secondary Mirror that is positioned near the front of the telescope. The Primary mirror of the telescope is precisely mounted in a Cell at the rear of the telescope. The Parabolic "Primary" mirror (illustrated below, and as seen from behind the telescope optical tube at left) is the factor by which most telescopes are described hence an 8" telescope has a primary mirror of 8 inch (203mm) in diameter with a versatile 1200mm mm focal length (f5.9). An English mathematician originated this optical design although Sir Isaac Newton first made it. What characterizes a reflecting telescope?: The Optical Tube Assembly (OTA) is an arrangement of the classic Newtonian reflecting telescope. With a comparatively small central obstruction, and fewer optical surfaces, the contrast and brightness can actually surpass more expensive and complicated designs such as the 8" Schmidt-Cassegrain telescope. The 8" aperture model is our most popular "first telescope" Dobsonian reflector, particularly attractive among those who desire an easily manageable telescope with the light gathering and fields of view potential to recognize many of the most popular deep sky objects (Galaxies, Star Clusters, Nebulae, Planetary Nebulae, etc.).Īnd yet this telescope affords the good contrast and clarity qualities required for lunar and planetary observing which actually may show changes through out an observing season. This is part of the equation that provides good portability while retaining a good range if useful magnifications. This telescope provides 48 inch focal length (f6 focal ratio), a versatile choice for amateur astronomy. For any astronomer seeking serious adventure, the XT8 has it all!Ībove Right: The Orion XT8 8"f6 Dobsonian telescope, current October 2001 model shown (17,527 bytes). Great light-gathering power, point-and-view simplicity, great optics, a rock-stable mount, and a host of features not found on competing Dobs. Our popular Orion SkyQuest XT8 telescope now provides you even more bang for the buck. Orion took the Dob that earned best of the batch honors from Sky & Telescope magazine (1/00) and enhanced it with even better engineered features, and accessories! And then Orion dropped the price, to boot. While the original Orion SkyQuest XT8 telescope became the most highly recommended production 8" Dobsonian style telescope, and was the reference standard for its type at Company Seven, Orion simply couldnt leave well-enough alone. Furthermore, the accessories included are common sense items to insure a good first night out these are items that would normally be optional for competing telescopes. These telescope benefit from years of study and refinement of those Dobsonian style telescopes already on the market they include advanced design and materials to keep them lightweight and simple to use. The Orion SkyQuest Dobsonian telescopes are designed for beginners who seek the best possible view of the faint Deep Sky objects while on a constrained budget. ![]() The first Orion product Company Seven chose to place on line! But then due to popular demand for a more fundamental option, it was reintroduced as the Classic XT series in January 2004. SkyQuest XT8 8"(20cm) Dobsonian This model was discontinued in August 2003 when it was replaced by the new SkyQuestª XT8 Intelliscope. Orion Introduction News Products Pricing Distribution NotesĪccessories Eyepieces/Oculars Filters Mounts Telescopes Company Seven | Orion SkyQuest XT8 - 8" Dobsonian TelescopeĬ-7 Home Page C-7 News Consignment Library Products & Services Product Lines Order Search C7.com
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