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Why Purchase from All-Star Telescope?
Free Expert Support
Whether you are a first timer needing help with setting up or an enthusiast that can't quite make that one thing work, our expert staff are ready to support your needs. With decades of knowledge and first hand experience we've been there and we can help you through it!
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30 Day Return Policy
Buy with confidence knowing that we accept returns up to 30 days after purchase. We want you to have something you will actually use and we are confident that we keep good quality products in our store with No Junk.
Price Match Promise
Shipping around for the best price is tough, we make it easier by offering the best pricing in the market. But if you find a better price on an in-store item somewhere else we will match it!
Product Description
Sky-Watcher’s Flextube SynScan GoTo Collapsible Dobsonian series are the telescopes your mother warned you about. Big aperture, bigger attitude, with all the innovations that make Sky-Watcher the obvious choice when hunting for that Goldilocks zone where value meets desire.
Ranging from the standard 8 to a whopping 16 inches in diameter, Flextube SynScan Dobsonians are precision engineered instruments that will allow you to easily find and enjoy viewing night sky treasures such as planets and the Moon, nebulae, star clusters, galaxies and much more. With its patented collapsible tube design, these Dobsonians are truly the ultimate in portability and performance which is crucial when travelling to dark skies to make the most of these impressively large telescopes.
The elegant truss tube design was carefully engineered to combine ease of use, extreme portability, and consistent performance in an affordable package. Unlike other truss tube designs, the Flextube Dobsonian does not need to be disassembled between uses. It transports as two compact pieces (optical tube and rocker box) that can be assembled and ready to use in just seconds! It is easy to collimate once set up, and it holds its collimation throughout the evening and even after being collapsed! The patented Tension Control Handle allows users to add or reduce tension, thereby increasing or decreasing the friction between the optical tube and the sideboards. The patented Freedom Find dual encoder design allows the telescope to be moved manually whenever the user wishes - but with no need for re-alignment!
The SynScan hand controller allows you to point your telescope to a specific object, or even tour the best objects in the night sky at the touch of a button!! The user-friendly menu system allows automatic slewing to over 42,900 objects. Even an inexperienced astronomer can master its variety of features in a few observing sessions.
The Flextube SynScan series seamlessly combines the convenience and affordability of the traditional Dobsonian with the performance and precision of a computerized GoTo telescope all to help you in your quest for big aperture views.
SynScan Hand Control:
- Built-in Wi-Fi control
- 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, and Solar
- Tracking mode: Dual Axis Tracking
- Alignment method: Brightest-Star Alignment, Two-Star Alignment
- Database: 25 user defined objects. Complete Messier, NGC and IC catalog, partial SAO catalogues, with a total 42,900 objects
- GoTo pointing accuracy: Up to 5 arc min
What can I see with a Sky-Watcher Flextube 400P SynScan GoTo Collapsible Dobsonian (S11840)?
Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.
Jupiter with
25mm Eyepiece - 72x Magnification
(Included with This Telescope)
Jupiter with
10mm Eyepiece - 180x Magnification
(Included with This Telescope)
Jupiter with
5mm Eyepiece - 360x Magnification
Sold Separately
Moon with 25mm Eyepiece
72x Magnification
(Included with This Telescope)
Moon with 10mm Eyepiece
180x Magnification
(Included with This Telescope)
Moon with 5mm Eyepiece
360x Magnification
Sold Separately
Andromeda with 36mm Eyepiece
50x Magnification
Sold Separately
Andromeda with 25mm Eyepiece
72x Magnification
(Included with This Telescope)
Andromeda with 10mm Eyepiece
180x Magnification
(Included with This Telescope)
What's in the Box
Specifications
| Optical Info | ||
| Optical Design | Newtonian | |
| Mirror Coatings | Radiant Aluminum Quartz (RAQ)? coatings with 94% reflectivity | |
| Glass Type | Borosilicate | |
| Primary Aperture (mm) | 406 | |
| F/Ratio | 4.4 | |
| Focal Length (mm) | 1800 | |
| Secondary Diameter | 102mm | |
| Secondary Obstruction (by diameter) | 25% | |
| Secondary Obstruction by Area | 6% | |
| Observational Info | ||
| Dawes Limit | 0.29 | |
| Rayleigh Limit | 0.34 | |
| Limiting Mag. | 15.5 | |
| Minimum Magnification | 58 | |
| Maximum Magnification | 799 | |
| Light Gathering (compared to next size down) | 30% | |
| General Info | ||
| Focuser | 2" Dual Speed Crayford | |
| OTA Length (Retract/Ext.) | 42.5"/66.5" | |
| OTA Outer Diameter | 17.875" | |
| OTA Weight (with accessories) | 72 | |
| Dob Base Weight | 105 | |
| Dob Base Measurements | 36"x34" | |
| Zenith Eyepiece Height | 74" | |
| Accessories | ||
| Included Finder | 9x50 Finder | |
| Included Diagonal | No | |
| Included Eyepieces | 25/10 Plossl | |
| Magnification w/ Included Eyepieces | 72x/180x | |
| Included Case | No | |
| Corrector | No | |
Additional Articles, Videos, and Links
Buying Your First Telescope - Part Two: Making the Choice
Once you have become familiar with the sky and have been enticed by the views through other peoples’ telescopes, you will want your own. So what to buy?
How to Pick the Best Telescope Eyepieces
Finding the right new telescope eyepiece can be a game changer. This post will help you to pick the best telescope eyepiece for your needs.