Each GSO imaging Newtonian telescope at Agena undergoes a thorough physical, mechanical, and optical evaluation at our shop upon arrival - all at no extra cost to you. It offers 40mm of focus travel and includes a focusing scale on the top of the drawtube to make it easy to return to the correct focus position during each observing session. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions. 8") f/5 Newtonian offers a fast focal ratio that's ideal for observing wide-field views of deep sky objects. Please let us know. This compact and affordable 200mm (approx. It also has a tension knob to allow you to secure heavier loads. 1/8 PV wavefront specification giving excellent images for any choice of subject. All rights reserved. Sign up for our newsletter to get exclusive deals, observing tips, and new product announcements. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.International Customers:Free shipping does not apply to international orders. Is the primary center-dotted?A. For years, GSO has made dobsonian telescopes sold under various labels. GSO's parabolic primary mirrors are perfect for those who want to build their own telescopes or replace mirrors in older ones. The ridged focus knobs give you a good feel and grip, even with gloved hands in cold weather. Portable, Light Weight, and Economical. BK7 is far superior in thermal characteristics to soda lime float glass - the glass used in consumer products like cookware - that's used in many reflectors in this price range. See photo 2 above for an example. Please let us know. Produced from quality low expansion Suprax glass from Schott Germany. 00 While this scope has a smaller field of view than a faster f/4 Newtonian, it exhibits less coma and field curvature, especially when used for visual observing with long focal-length eyepieces or small cameras. Copyright © 2003-2020 Agena AstroProducts. 18 INCH Glass Reflector Telescope Mirror Lens Optical Optics 1” Thick. The precisely figured 8" f/5 primary mirror is made from BK7 optical glass for enhanced thermal stability. A larger telescope primary mirror will also make your telescope heavier and longer. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions. A 20-inch telescope mirror for sale will collect 6.25 times more light than an 8-inch telescope mirror will. A couple of these uncoated edge strips will typically be covered up by the clips in your mirror cell anyway. The precisely figured 8" f/5 primary mirror is made from BK7 optical glass for enhanced thermal stability. Is a test report included with each mirror? GSO uses high-volume, state-of-the-art, high quality manufacturing and test lines. This 8-inch reflector telescope is a great choice if you love to observe deep-space objects. We manufacture telescopes and accessories such as telescope wheels, carrying cases, guiding computers, focusers, motors and motor controls and much more. Contiguous US Customers:All items we sell ship for free within the Contiguous US. 8") f/5 Newtonian optical tube assembly (OTA) from GSO has fast optics for wide-field views of the night sky. The bottoms of the rings have threaded mounting holes for a Vixen-style mounting rail (which is included). With classic Newtonian optics, this scope is easy to use and comes ready to go out of the box. These rings make it easy to rotate the tube to bring the focuser and finder to the most comfortable viewing position. You can easily center-dot the primary yourself if the mirror you receive is not dotted. Zambuto Optical Company is a full service custom manufacturer of premium Newtonian primary telescope mirrors from 7" through 24" diameter. However, serious imagers with larger DSLR or astronomy cameras may wish to consider a GSO f/4 Imaging Newtonian or the GS630-LRN upgraded version of this item since these telescopes have a more robust dual-speed linear-bearing Crayford focuser. GSO guarantees diffraction limited performance, but their mirrors typically have a mirror surface quality of 1/16 wave RMS at least, and often better. Round Mirror Plate - Set of 12 Round Mirror Trays - 8 inch Diameter, 1.5 mm Thick Rounded Edge - Perfect for Table, Wedding Centerpieces, Wall Decor, Crafts 4.8 out of 5 stars 597 $21.00 $ 21 . Go-To & Computerized TelescopesRoot - Agena, Miscellaneous Mount AccessoriesRoot - Agena, Agena Thanksgiving / Black Friday / Cyber Monday Sale, GSO 8" f/5 Newtonian Reflector Telescope - Steel OTA (White) # GS630, Skip to the beginning of the images gallery. Star test: Finally, we collimate the complete telescope and perform an autocollimation test with an artificial star to examine the overall system's image performance at the focus point. If you want a center-dotting sticker, just request one from us at the time you place your order.If you want a mirror that does not have this center dot, please check with us before your purchase. 1. It includes a dual-speed 2" Crayford-style focuser, dual split-hinged mounting rings, a 8x50mm straight-through finder, and a 13" Vixen/Synta-style red dovetail rail. During checkout, you may also be shown other optional faster shipping choices.US Customers in Hawaii and Alaska: Free shipping applies to almost all products. 2. Sometimes yes but mostly no.