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Sky-Watcher 16" Flextube SynScan GoTo Collapsible Dobsonian - S11840
Sky-Watcher 16” Flextube SynScan GoTo Collapsible Dobsonian
Wow! This is a really big telescope in an amazingly small package! The Sky-Watcher 16” Flextube SynScan Collapsible Dobsonian will really put on a show! From a dark sky site, you can discern color in brighter nebulae, and you may even see objects that are normally only enjoyed in photographs, like the Horsehead Nebula. Some astronomy enthusiasts buy a big Dob like this as their visual telescope, and then have a smaller refractor or SCT as their imaging telescope. Regardless, this is all the scope you’ll ever need, and because the OTA collapses down to about 42” in length, most healthy adults can set it up by themselves.
Sky-Watcher GoTo telescopes offer the convenience and affordability of the traditional Dobsonian with the convenience of a computerized Go-To telescope. The included SynScan AZ hand control allows you to point your telescope at a specific object, or even tour the night sky at the touch of a button! The user-friendly menu system allows automatic slewing to over 42,900+ objects after a simple two-star alignment procedure is performed. Even an inexperienced astronomer can master the features of the SynScan Dobsonian in a few observing sessions. The patented dual encoder design allows the telescope to be moved manually whenever the user wishes - but with no need for re-alignment!
What is a Dobsonian Telescope?
John Dobson, an avid amateur astronomer connected to the San Francisco Sidewalk Astronomers, designed a simple yet elegant telescope mount in the 1970’s that was easy to build and could handle a basic Newtonian telescope tube. Dobson wanted people to have the ability to build their own telescope out of inexpensive materials. In fact, hundreds of people, under Dobson’s tutelage, learned to grind their own mirrors, and these mirrors were put to use in what has come to be known as a “Dobsonian” telescope.
What makes a telescope a Dobsonian is the base that the telescope tube sits on. The tube itself is a simple Newtonian, designed by someone you may have heard of…Isaac Newton. Before John Dobson invented his simple telescope base, Newtonian telescopes were usually mounted on a large, heavy equatorial mount. They were neither simple, portable, nor inexpensive. Instead, Dobson made a heavy-duty box, modified to hold the optical tube, and mounted it on a lazy-suzan type base. The telescope tube only took a few simple modifications to allow it to ride on the base. When he had finished the final tweaking, a new alt-azimuth mount was born. The telescope could be pointed to anywhere in the sky by either rotating the box on the lazy-suzan base, or by pushing the telescope up or down. The Dobsonian was born.
How is the Collapsible Dob Different From a Traditional Dobsonian?
Classic Newtonian telescopes consist of optics in a closed metal or treated cardboard tube. The Traditional Dobsonians from Sky-Watcher make use of this age-old design because of its relative ease of manufacture and therefore, low cost. However, because these tubes are closed (like a cardboard tube from an empty roll of paper towels, only bigger), storage or transport can sometimes be a challenge. To solve this problem, large Dobsonians were manufactured with a “Truss Tube” as opposed to a closed tube. Basically, the center part of the tube was replaced with struts…only the front and back of the tube, which held the optics, remained solid. This allowed the telescope tube to break down into several pieces (front end, back end, and individual struts), which instantly made it more portable.
The problem with truss tube telescopes, if there is one, has to do with all the pieces, especially the loose struts. Sometimes people would forget a strut at home, or it would become damaged, and the whole telescope wouldn’t or couldn’t go together. Sky-Watcher came up with an innovative idea by making the telescope “collapsible”. In other words, the telescope tube doesn’t break down into pieces. Instead, the trusses collapse into the bottom part of the telescope tube and allow the top part of the scope to sit nicely on the bottom piece. Voila! Your telescope has lost about half of its length but the components stay in place!
How the Sky-Watcher Tension Control Handle Improved the Dobsonian
The currently available devices for stabilizing a telescope on a Dobsonian mount include a sliding weight to counter balance the weight of the telescope, a friction lock that must be adjusted to inhibit movement of the telescope, and a spring attached between the telescope tube and mount to aid in stabilization. These devices are inconvenient to use because they do not provide a simple and user-friendly way to adjust the friction.
The object of the Sky-Watcher Tension Control Handle invention (US Patent No. 6,940,642) is to provide a tension adjuster that users can easily turn to add or reduce tension, thereby increasing or decreasing the friction between the optical tube and the sideboard of the mount. By providing such a tension adjuster, the telescope does not need to be balanced in order to stay in position. The tension adjuster can be tightened such that the optical tube can stay in a position but can still be moved when prompted to adjust the position of the optical tube. Alternatively, the tension adjuster can be completely tightened to lock the optical tube in position.
More About the SynScan AZ GoTo System
The Sky-Watcher SynScan AZ is a precision-engineered instrument that provides two different operation modes:
The Sky-Watcher Dobsonian SynScan telescope has a patented dual encoder design incorporated to record the position of the telescope. Under the Auto-Tracking Mode, you may choose to move the telescope, either manually or electronically, to any position without deactivating the tracking mode. After moving to a new object, the telescope will automatically begin to track the new object accurately. No re-setup is required in one observing session.
If you are familiar with the night sky, or if you wish to quickly set up the telescope for tracking an object, AUTO-TRACKING MODE will allow you to operate the telescope in the traditional way with added bonus of automatic tracking and digital setting circles.
The AZ GOTO MODE provides extensive computerized GoTo functions to assist you in finding and enjoying a multitude of night sky treasures, such as planets, nebulae, star clusters, galaxies and much more. The Sky-Watcher SynScan AZ Hand Control allows direct access to all the motion controls of the telescope as well as a 42,900 object database with a range of preset objects. The Hand Control comes with a dual-line, 16 character display screen that is backlit for comfortable viewing of the telescope information and scrolling text.
Sky-Watcher GoTo Collapsible 16” Dobsonian Specs
- Optical Design: Newtonian
- Mirror Type: Parabolic
- Primary Mirror Aperture: 406 mm
- Secondary Mirror Aperture: 100 mm
- Focal Length: 1800 mm
- F/Ratio: F/4.4
- Highest Practical Power: 812x
- Faintest Stellar Magnitude: 15
- Finder Scope: 8x50
- Focuser Diameter: 2” with 1.25” adapter
- Eyepiece: 1.25" Super 25 mm and 10 mm
- Power Supply: 10 to 15 V DC 1Amp, 2.1mm Plug (Center positive)
- Motor type: DC Servo Motors
- Resolution: Motor encoder: 1,620,000 counts per revolution, Main axis encoder: 11,748 counts per revolution
- Slew speeds: 1.0X, 2.0X, 8X, 16X, 32X, 200X, 400X, 600X, 800X, 1000X
- Tracking Rates: Sidereal, Lunar, Solar
- Tracking Mode: Dual Axes Tracking
- Alignment Method: Brightest-Star Alignment, Two-Star Alignment
- Database: 25 user defined objects. Complete M, NGC and IC catalog, partial SAO catalogues, total 42,900 objects
- Go-To Pointing Accuracy: Up to 5 arc min
- Shipping Weight: 96 kg total (three boxes)
Please note that this Dobsonian will need some assembly, especially the base, which is flat-packed.