Capture breathtaking photos with our affordable astrophotography cameras. This doesn't mean the scope will never be able to reach those higher "theoretical" powers - there will be that rare night where the atmosphere is perfectly still and the scope can be pushed past it's practical limit, but those nights will be few and far between. What's more, this compact imaging specialist is conveniently lightweight at just 12.7 lbs. It will easily fit on mounts that have smaller weight capacities. Cassegrain telescopes routinely use spheres in addition to other lenses in the optical path to correct for residual spherical aberration. The bright area points toward the center of the field. For imaging with most Newtonians, a coma corrector lens is required. Typically in-stock items will ship first and backordered items will follow as soon as they are available. For complete warranty details contact us at sales-eu@telescope.com. In metric units, this is: Resolving power (in arc seconds) = 116 divided by aperture of telescope (in millimeters). It can be used with 35mm cameras, DSLRs, web-cams, DSI-type cameras, and large format CCD cameras alike. . These scopes will appeal to the more technically inclined. Standard achromatic refractors routinely use Crown and Flint for the two elements, but more expensive apochromatic refractors can use ED (extra low dispersion) glass for one or more of the lenses. They typically take a bit longer to learn and need some set-up or adjustments. Above: Appearance of a star at the edge of the field of view in a telescope suffering from coma. Designs range from a standard air-spaced doublet (two lenses in a row) to exotic designs such as oil-spaced triplets and 4-element multi group lenses. Availability: Estimated shipping time is 3-5 Days *Extended Warranty Options * Required Fields. The reflector's 6" (150mm) aperture and fast focal ratio will amaze you with high-contrast views of the cosmos. Try again. Its 6 inch parabolic primary mirror has 610mm of focal length, making the fast f/4 Newtonian an ideal wide-field astrophotography telescope. The 6" f/4 Newtonian Astrograph Reflector features a precise, 2" (50.8mm) dual-speed (10:1) linear-bearing Crayford focuser which lies 7" (17.8cm) back from the front of the 22.5" (57.15cm) long optical tube. This warranty gives you specific legal rights. }. Intermediate Level - These scopes offer higher performance and more advanced features than Level 1: Beginner models. This shopping feature will continue to load items when the Enter key is pressed. The theoretical resolving power of a telescope can be calculated with the following formula: Resolving power (in arc seconds) = 4.56 divided by aperture of telescope (in inches). Pair of hinged tube rings, 2" extension tube, 13" Vixen-type dovetail bar, 8 x 50 finder, dust cover, Steel reinforcing plate under focuser, Oversized secondary mirror for fully illum. "Diffraction Limited" means that the limits of image detail are determined by the physical properties of light, and not by optical defects in the telescope. The distance from the center of a curved mirror or lens at which parallel light rays converge to a single point. On a good night (a night where the air above is steady and the stars aren't twinkling), the practical upper limit of a large telescope is 300x, even thought the theoretical limit may be much higher. Apertura's 6" f/4 Imaging Newtonian OTA is a great telescope for those beginning astronomers looking for a way to get started observing or imaging in deep space. {"closeOnBackgroundClick":true,"bindings":{"bind1":{"fn":"function(event, startIndex, itemCount, newItems) { QuickLookWidget.assignEvents(newItems); $(\".Quicklook > .trigger\", newItems).bind(\"quicklookselected\", function(event, source, x, y) { OverlayWidget.show(\'#_widget157230578007\', event, source, x, y); }); }","type":"itemsloaded","element":".PagedDataSetFilmstripLoader > .trigger"},"bind0":{"fn":"function(){$.fnProxy(arguments,\'#_widget157230578007\',OverlayWidget.show,\'OverlayWidget.show\');}","type":"quicklookselected","element":".Quicklook > .trigger"}},"effectOnShowSpeed":"","dragByBody":false,"dragByHandle":true,"effectOnHide":"fade","effectOnShow":"fade","cssSelector":"ql-category","effectOnHideSpeed":"1200","allowOffScreenOverlay":false,"effectOnShowOptions":"{}","effectOnHideOptions":"{}","widgetClass":"OverlayWidget","captureClicks":true,"onScreenPadding":10}. Check out our colorful A pair of hinged, die-cast aluminum tube rings with felt lining are included, which each have flat bosses on the top and bottom featuring M6 threaded sockets for easy attachment of the included Vixen-style mounting bar and additional imaging accessories. Orders received by 5pm UTC for in-stock items ship the next business day. Referring to the manual is recommended. Unable to add item to List. -- robust mechanics for heavy loads Above: Image of the Crescent Nebula taken with a 10″ f/6 Newtonian. There was a problem completing your request. Your question may be answered by sellers, manufacturers or customers who bought this product. The super-steady linear-bearing Crayford focuser design will hold heavy imaging payloads without slippage. Breakdown by star, we pride ourselves on an unswerving commitment to best products! In check out our colorful catalog, filled with hundreds of quality products address book contact! 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