Cassegrain telescopes, such as Maksutov-Cassegrains, "fold" incoming light using two mirrors and a front "corrector" lens. They typically take a bit longer to learn and need some set-up or adjustments. Fast 6" f/4 Newtonian optics for wide-field imaging with DSLRs and a wide range of CCD and CMOS astronomy cameras Fully and rigorously tested on site for cosmetics, mechanical operation, and optical performance by a master optician to ensure excellent overall telescope operation and customer satisfaction (an Agena exclusive service) Includes Mini 50mm guide scope, StarShoot AutoGuider, adjustable bracket, and more. width: 90, entityId: 99798, sourceSelector:'' The atmosphere above us is constantly in motion, and it will distort the image seen through the telescope. layers: 'VID018-IntroUseMoonFilters' 2" dual-speed linear bearing Crayford focuser with 2" and 1.25" compression ring accessory adapters. An 8x50 straight crosshair finder scope with dovetail bracket and snap-on dust cap are also included. height: 160, - In a newtonian telescope, one of the biggest contrast killers is an oversized diagonal mirror. layers: '24781' 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. sourceSelector:'' Both primary and secondary mirrors boast enhanced reflectivity (94%) aluminum coatings to optimize contrast with a protective silicon dioxide (quartz) overcoat. }, { 6" (150mm) aperture and 750mm focal length Newtonian reflector optics provides pleasing views of a rich variety of celestial objects from the close-by Moon to distant galaxies and cloudy nebulas. defaultImage: '', entityId: 102815, Pair of hinged tube rings, 2 inch extension tube, 8 x 50 finder, dust cover, Steel reinforcing plate under focuser, Oversize secondary mirror for fully illum. defaultImage: '', Binoculars with larger objective lenses collect more light, which increases image resolution and brightness. entityType: 'product' This recessed focuser position helps maximize contrast by blocking stray off-axis light for high-resolution performance. What's more, this compact imaging specialist is conveniently lightweight at just 12.7 lbs., so it doesn't require a huge mount to support it. sourceSelector:'' Our 6 inch aperture imaging reflector is loaded with useful features useful features to help you capture high-resolution images of the night sky. With very fast f/4 optics and 94% reflectivity coatings, the Orion 6″ Newtonian Astrograph will help you acquire outstanding high-resolution images of deep-sky objects with delightfully short exposure times so you can get great results in less time. }, {"clickFunction":"function() {$(\'#_widget1044785793045\').widgetClass().scrollNext(\'#_widget1044785793045\');}","widgetClass":"ButtonWidget"}, {"snapClosest":true,"bindings":{"bind0":{"fn":"function(event, pageNum) { PagedDataSetFilmstripLoaderWidget.loadPage(\'#relatedCommunityItemsarticle\', Math.floor(pageNum)); }","type":"scrollend","element":"#_widget1044785793045_trigger"}},"unitSize":200,"widgetClass":"SnapToScrollerWidget","scrollSpeed":500,"scrollAmount":600,"afterScroll":"","animateScroll":"true","beforeScroll":"","direction":"horizontal"}, {"emptyItemViewer":"
","imageThreshold":3,"pages":2,"dataModel":{"imageWidth":160,"cacheEntitiesInRequest":true,"isCommunityRelated":"true","entityId":"116530","entityTypeId":"4","relationTypeId":"17","dataProviderWidget":"com.fry.ocpsdk.widget.catalog.dataproviders.RelatedEntitiesDataProviderWidget","imageHeight":160,"itemViewerWidget":"com.fry.starter.widget.viewers.ItemViewerWithQuickLookWidget","isPDP":"true","direction":"horizontal"},"pageSize":4,"widgetClass":"PagedDataSetFilmstripLoaderWidget","loadThreshold":1,"direction":"horizontal"}, {"clickFunction":"function() {$(\'#_widget1044785793090\').widgetClass().scrollPrevious(\'#_widget1044785793090\');}","widgetClass":"ButtonWidget"}, { They have exceptionally fine optics and mechanics. The rolled-steel Newtonian Reflector optical tube's 6"-aperture parabolic primary mirror measures 610mm in focal length, making the optically fast f/4 Astrograph a perfect choice for going after wide-field images of distant deep-space objects. At Orion, we are committed to sharing our knowledge and passion for astronomy and astrophotography with the amateur astronomy community. entityId: 103188, What's more, this compact imaging specialist is conveniently lightweight at just 12.7 lbs., so it doesn't require a huge mount to support it. defaultImage: '', entityType: 'product' layers: '10269_alt01' sourceSelector:'' Not sure how to choose a telescope? sourceURL:'/catalog/community_content_viewer_placeholder.jsp?productId=99816&isPDP=true', defaultImage: '', entityId: 99810, This recessed focuser position helps maximize contrast by blocking stray off-axis light for high-resolution performance. defaultImage: '', }, { "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. Refractor telescopes refract, or "bend" incoming light to a focus by means of an objective lens. - If possible, the diagonal minor axis should be kept under 20% of the ... Orion StarShoot 100% . }, { With very fast f/4 optics and 94% reflectivity coatings, the Orion 6" Newtonian Astrograph will help you acquire outstanding high-resolution images of deep-sky objects with delightfully short exposure times so you can get great results in less time. Orion Optics VX8 f/4.5 Newtonian reflector Orion Optics’ VX series is aimed at those who want a quality, easy to use telescope. defaultImage: '', sourceURL:'/catalog/community_content_viewer_placeholder.jsp?productId=103188&isPDP=true', With very fast f/4 optics and 94% reflectivity coatings, the Orion 6 inch Newtonian Astrograph will help you acquire outstanding high-resolution images of deep-sky objects with delightfully short exposure times so you can get great results in less time. Contrast-enhancing extended tube length. 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. Since the primary mirror is made of thermally stable B270 glass, it acclimates to ambient temperature more quickly than standard reflector telescopes. entityId: 99897, entityType: 'product' width: 160, A per-item shipping charge (in addition to the standard shipping and handling charge) applies to this product due to its size and weight. defaultImage: '', sourceSelector:'' Orion 6" f/4 Newtonian Astrograph Reflector Telescope - 10269 . Telescopes with larger optical diameters collect more light, which leads to an increase in brightness and image resolution compared to smaller instruments. Submit astronomy articles, events, & reviews, and even become a featured Orion customer! Orion 6" f/4 Newtonian Astrograph Reflector Telescope - 10269 . This telescope was designed with the goal of being ideal for the astronomer looking to capture high-resolution images of deep-sky objects with minimal exposure time, letting you maximize every hour of precious night-time that you can get with your scope set up and … Telescopes on either very lightweight mounts or non tracking mounts (such as Dobsonians) are capable of only very short exposures such as lunar photographs. height: 90, Referring to the manual is highly recommended. Starry Night SE astronomy software digital download insert. height: 90, height: 160, This warranty is for the benefit of the original retail purchaser only. 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. Fits telescopes with 158-193mm outer diameter.