RS-232 serial cable Refractor telescopes refract, or "bend" incoming light to a focus by means of an objective lens. The lightweight primary mirror cools more efficiently than standard flat-back parabolic mirrors, thanks to its thin, curved-back design. In metric units, this is: Resolving power (in arc seconds) = 116 divided by aperture of telescope (in millimeters). Some mounts are compatible with a motorized Go-To system for fully automated computer finding of objects in the night sky. Refractors use a series of lenses to provide a clear image. Hand controller mounting bracket Some initial assembly may be required. The primary mirror is held in place by an open-ventilation mirror cell which also helps the mirror to acclimate quickly. Orion SkyQuest XX16g is a well-known option at the top of the price range. This warranty gives you specific legal rights. It's in the top 3 bestselling reflector telescopes and has quite a few popular alternatives in the same price range, such as Orion SkyQuest XX14g or Orion SkyQuest XX14i . Limited Warranty against defects in materials or workmanship for one year from date of purchase. width: 200, Heavy-duty clutches on both axes allow independent adjustment of motion to desired level of resistance. Its Orion-designed collapsible Dobsonian base and 8-pole truss optical tube makes transportation of this hefty telescope easy since the entire telescope can be disassembled without tools into small, manageable component pieces that can fit in virtually any standard size car. 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. 16" parabolic primary mirror and support cell SynScan hand controller and cables Orion SkyQuest XX16g is a well-known option at the top of the price range. Yes, you can take this big telescope with you, because both the Dobsonian base and optical tube of the XX16g were engineered by Orion to quickly disassemble - without tools - into easily manageable components, the heaviest of which (base groundplate assembly) weighs 61.4 lbs. You have the option in check out to request that your order ship complete, if you'd prefer. Reflector telescopes use a pair of large and small mirrors to direct incoming light to the eyepiece. These scopes will appeal to the more technically inclined. Some are intended for specialized uses. DeepView 28mm 2" eyepiece 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. Our largest Dobsonian reflector yet is an ideal combination of three key telescope features: large aperture, convenient portability, and precise GoTo object location. Extension tube, 2" They typically take a bit longer to learn and need some set-up or adjustments. Orion offers telescopes for every level: Beginner, Intermediate, Advanced, and Expert. 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. counterweights (x9) The closed-loop electronics let you slew the telescope by hand if desired, while still maintaining the GoTo alignment. Dust covers (x2) Delivery is not available to APO/DPO/FPO addresses or Canada. Standard Delivery: $200.003 Day Delivery: $533.002 Day Delivery: $533.00Next Day Delivery: $630.00, SHIPPING RESTRICTIONS APPLY FOR THIS PRODUCT. The limiting stellar magnitude is a measure of the faintest star you can see through the telescope. Keep your XX16g optical tube safe and clean during transport or storage with the recommended optional Case Set (sold separately). 0-100 scale indicating how frequently people buy the product online. Some are easy to use but are but on the large or heavy side. This warranty is for the benefit of the original retail purchaser only. Heavy-duty clutches on both axes allow independent adjustment of motion to desired level of resistance, Huge 16" (406mm) diameter, convex-back parabolic primary mirror with enhanced, 94% reflectivity aluminum coating delivers outstanding views of faint deep-sky objects.