The ideal workhorse for the deep sky observers, the Explore Scientific 20-inch f/3.6 Truss-Tube Dobsonian is our largest aperture telescope. Can be rebuilt around any optician's mirror. Some of the best telescopes of 2018 straight from Virginia. 262 E Parkwood Rd Those looking for a more in-depth experience can reserve a night on the Advanced Observing Program.". - Active Cooling. - 6061 Aluminum Mounting Rings - CNC Machined. - Designed Engineered and Modeled in SolidWorks. The scope is perfect for bigger observatories. - Precision Secondary Mirror Focuser. The 500mm mirror collects 5100 times more light than the naked eye. We have a great online selection at the lowest prices with Fast & Free shipping on many items! - Precision Secondary Mirror Focuser. - CNC machined Composite Dust Cover over primary mirror. - Conical Secondary Light Baffle. Each evening, we offer a public program like no other. We’ll view everything from planets to distant galaxies using our 20-inch and 16-inch Ritchey-Chrétien telescopes from RC Optical Systems. Decatur, GA 30030 RCOS Carbon Truss 20 inch Ritchey-Chrétien Telescopes... Use an RCOS 20RC at NOAO's Kitt Peak National Observatory (RCOS 20" f/8.2 with ION Milled optics shown). At our Visitor Center and its multiple observatories, the public is invited to learn about … This program is an introductory star-gazing program.     •     - RCOS "Focus and Forget" Technology. At f/4 this is the fastest mirror Carl has ever offered commercially, and of course, Webster Telescopes brought it to you first. Get the best deals for 20 inch telescope at eBay.com. The TS 20" f/8 Ritchey-Chrétien astrograph is a ultimate telescope for astrophotography. A member of my Local Astronomy Club in Niagara (RASC – Niagara Centre) owns a massive 20 Inch Dobsonian Telescope that he will often bring out to our Observatory Site in the summer. - CNC machined Composite Dust Cover over primary mirror. - Supporting Fringe Analysis and Interferometric Data included. - RCOS CNC Machined "light weight" Dovetail Plates (Losmandy compatible) - top and bottom with matching Paramount VersaPlate hole pattern, allows dovetail mounting plate to be bolted to VersaPlate once scope is balanced. Mechanical Features: Due to the popularity of this program, it is recommended that you make reservations 2 to 4 weeks prior to your visit. This telescope is so huge, that you must climb a ladder to look through the eyepiece when it is pointing at … But for NASA … - Enhanced Aluminum (SiO2/TiO2) Overcoat - 96.9% Reflectivity. The 20" is the ultimate blend of cost, ease of use, and visual impact. Building 20 inch truss-tube Dobsonian telescope The courage to undertake this project resulted from successful completion of 24 inch f4.5 Venor Telescope by fellow members of RASC - Kingston Centre. Mechanical Features: Optical Features: High Quality Custom Dobsonian Telescopes- Only the best reflector telescopes, handmade in the USA. - 6061 Aluminum components - All CNC Machined. - RCOS Proprietary 18-Point Primary Mirror Flotation Cell. - RCOS Proprietary Center Mounted, Self Balancing Primary Mirror Cell. Complete and fully assembled OTA Price: Call. - - Zero Expansion Astro-Sitall, ULE Type, or Zerodur RC Optics, Tested and Certified to at least 1/20th Wave RMS. "High atop Kitt Peak sits the largest collection of optical research telescopes anywhere in the world. - Designed, Engineered and Modeled in SolidWorks. - Supporting Fringe Analysis and Interferometric Data included. - 6061 Aluminum Mounting Rings - CNC Machined. Use an RCOS 20RC at NOAO's Kitt Peak National Observatory (RCOS 20" f/8.2 with ION Milled optics shown). Each evening, we offer a public program like no other. - Multi-Stage Primary Mirror Baffle with internal knife-edge light stops. 20-Inch Waite Telescopes Waite Telescope Mirrors Polished to Perfection Premium, hand-figured telescope mirrors and innovative telescope designs by Waite Research Renegade Telescopes Now Available with 10" to 27 . - Enhanced Aluminum (SiO2/TiO2) Overcoat - 96.9% Reflectivity. - Zero Expansion, Astro-Sitall Ritchey-Chretien Optics, Tested and Certified to at Least 1/40th Wave RMS (root mean square).  While many construction steps were carried alone in my basement, I … 20" f/4- D20 The completely redesigned D20 features a 20" primary mirror by legendary optician Carl Zambuto . From your first telescope to precision, observatory-grade instruments, we have the perfect telescope to suit your experience level and budget. - Multi-Stage Primary Mirror Baffle with internal knife-edge light stops. - RCOS "Focus and Forget" Technology. (404) 906-1024     •     Our user friendly design, craftsmanship second to none, one person set up and super smooth operation have since made Obsession the standard by which all other Dobsonians are compared. - 6061 Aluminum components - All CNC Machined. - Active Cooling. The scope is perfect for bigger observatories. The Obsession 20" is the scope that in 1989 revolutionized the Dobsonian. - Low expansion, light weight Carbon Fiber Truss for superior performance and stability. Optical Features: - Shipped fully Assembled, Collimated and Ready to Use. "High atop Kitt Peak sits the largest collection of optical research telescopes anywhere in the world. At our Visitor Center and its multiple observatories, the public is invited to learn about and gain hands-on experience with the latest astronomy has to offer. Deep Sky Instruments - Low expansion, light weight Carbon Fiber Truss for superior performance and stability. Find out why Celestron is the world's #1 telescope brand. Contact Us, Copyright © 1999-2015 - Deep Sky Instruments - All Rights Reserved. Review: Meade MAX 20" telescope Even a basic telescope can deliver clear views of celestial regulars like Jupiter and its moons. - Shipped fully Assembled, Collimated and Ready to Use. The Hybrid truss telescope design is quickly becoming a favorite. Discovery and excitement await! Details on planets and The GSO 20" f/8 Ritchey-Chrétien Truss Tube Astrograph is a true RC telescope and will give you spectacular photo results also with large format camera sensors. This experience is always a real treat, as the views through this giant “Dob” are incredible. - RCOS CNC Machined "light weight" Dovetail Plates (Losmandy compatible) - top and bottom with matching Paramount VersaPlate hole pattern, allows dovetail mounting plate to be bolted to VersaPlate once scope is balanced. - Conical Secondary Light Baffle.     •     If you’ve only just found out about the Nightly Observing Program, please consider joining the nearly 7000 people each year who experience the thrill of an evening on Kitt Peak. If you want an instrument that will provide you with a lifetime of … 12.5 inch, 18 inch, 20 inch, 22 inch and bigger.     •